Welcome to NGA, Scofield23. Without pictures of the blooms, it would be difficult to tell for sure. But yes, I suspect that there are two varieties of hydrangeas growing. See the link below for pictures of the blooms that the different types of hyddrangeas produce:
https://plantaddicts.com/types...
Multi-colored blooms suggest that you have a hydrangea macrophylla, usually just called a mophead or a lacecap due to the shape of its blooms. They are the only hydrangeas whose bloom responds to the presence of aluminum in acidic soils (by turning the colored blooms a shade of blue), the presence of aluminum in alkaline soils (by turning a shade of pink) or the lack of aluminum (by turning a shade of pink). Some varieties mix the colors and also show shades of purple.
Mopheads are more sensitive to cold winters and to afternoon/evening sunlight (makes the leaves wilt in the summer). Their stems tend to get zapped by winter cold if one does not winter protect them. If they are winter protected, the stems will leaf out and they will bloom in early/mid(?) Spring from invisible flower buds that were developed at the end of the summer or around the start of autumn. If those stems do not leaf out by around the end of May, there is a very low chance of leaf out and so, they can be pruned all the way down.
While the stems may be zapped, the roots are not, so the roots will send new growth in Spring. If the mophead is a type commercially called a rebloomer it will bloom again. Examples of this are the Endless Summer Series, the Together & Ever Series, the Let's Dance Series, etc. Rebloomers are not really rebloomers. They are remontant and might produce blooms from this new growth that you see. If the stems get tall enough and old enough before winter sets in the the Fall, you will see new blooms from the new growth. Usually their invisible flower buds open in the Summer months (they look like small broccoli heads).
There is also another type of hydrangea called a Smooth Hydrangea or an Annabelle Hydrangea (because of its most popular hydrangea). That may be the other one that you have. It is winter hardy to Zone 3 so it tends to handle winter better. It produces white round-ish blooms in late Spring -ish, although some new varieties can produce shades of pink that hardly change when there is aluminum, when there is not and when there is but the plant cannot absorb it (in alkaline soils). As before, wait for the stems to leaf out. If they do not leaf out by the end of May, you can cut these down to the ground. Smooth hydrangeas produce blooms from invisible flower buds that they develop in Spring, probably in mid-to-late Spring where you live.
It is probably best not to prune some of these smooth hydrangeas. I cannot tell which variety you have but, s-o-m-e varieties tend to have large blooms that cause the stems to flop when the blooms get wet and weight too much. It is therefore best to let the stems' wood get older and harder by not pruning so they will not flop as much.
When it comes to pruning, hydrangeas do not have to be pruned if they are planted where they can attain their estimated size at maturity (given in the plant label). So pruning is not something you should make a habit of. But we gardeners like to prune in Spring. So, there are some cases when it is ok: you can prune branches that cross; you can prune branches that grow "too much" and are aesthetically "out of sync" length-wise from the other stems; you can prune branches to let more sun into the inside of the plant (useful when you have fungal issues); you can prune plants that are growing into walkways; etc.
Deadheading is not the same as pruning but it refers to removing the old spent blooms from last year. The blooms are held by a single string and they attach to the ends of the stems. This is an area where flower buds for this year will develop. So deadhead by cutting the little string that connects the bloom to the stem and not by pruning the end of a stem. I typically let Mother Nature do the deadheading for me but you can deadhead in the middle of winter or at the end of the summer.
The link below talks about pruning hydrangeas. At the bottom of the page, they also talk about deadheading.
https://plantaddicts.com/pruni...
Lastly, there is another type of hydrangea that you may have, instead of those Smooth Hydrangeas. They are called paniculatas because they produce panicle-shaped blooms. They too are winter hardy to Zone 3 and most produce flower buds & blooms in late Spring to late Summer. The leaves on your last picture may be of a paniculata but since it looks like it just leafed out and the leaves are so tiny, I am not 100% sure. Some varieties get quite large and newer versions tend to be more compact. The majority of paniculatas' blooms start either green or white, then turn white, then get some green and-or pink splotches, then they turn brown. Paniculatas are the most sun tolerant of all hydrangeas and in northern climates, they typically can be planted in full sun.
Does that help you, Scofield23? Luis