was purchased as Philodendron Imbe Variegata, but not sure what it really is

it most likely is

Philodendron sagittifolium 'Variegata' or Philodendron jose buono

Wow, that's a beauty! I love the variegation in those leaves! This one is listed as "Also Sold As" P. imbe 'Variegata': Variegated Philodendron (Philodendron 'Whipple Way')

i don't think so Lin
if you look up Whipple way it looks similar but is very expensive and just a little bit different
wish there was a place to confirm this kind of info
like i say above in my edit i think it will be one of
Philodendron sagittifolium 'Variegata' or Philodendron jose buono

I have a Philodendron 'Jose Buono' that was given to me as Philodendron imbe but the leaves on mine aren't showing a lot of variegation.

I think @Gina1960 grows Philodendron sagittifolium 'Variegata' maybe she can take a look at your photo and offer suggestions as to identity.

looking closer at the leaves
your Philodendron 'Jose Buono'
looks closer to Philodendron 'Whipple Way' then mine does
my leaves look more like Gina's Philodendron sagittifolium 'Variegata'
look how deep your lobes are at the stem junction versus mine

Indeed it does ... these names sure confuse me.

I got the P. sagittifolium var. at, if memory serves me correctly, the USF Botanical Gardens sale at Tampa. It was (incorrectly) labeled P. imbe ilsemanii. Later, I got a cutting of P.Jose Buono from a trade with a good friend from St Pete who had ALSO bought THAT labeled (incorrectly) Philo Imbe Ilsemanii. I think at this time (mid-2000's) a few different Philos were making the rounds all with the same (incorrect) name.
My experience with both of these has been that the variegation is extremely variable. I can have extremely variegated leaves with a ton of white, half and half leaves, almost all green leaves, and leaves that are green but variegated also with lighter shares of green. The variegation on them is chimeric, non-patterned so its bound to be highly variable.
One of the main hallmarks of Jose Buono is that it is pretty fast growing and the leaves can reach 2+ feet long. The sag var not so much. The auricles on Jose Buono and on the sagittifolium are close in morphology, Whipple's Way does have a much deeper dive between the ears

then as far as i am concerned it is a Philodendron sagittifolium 'Variegata'
and i will label it as such

LOL Dick I think the only way to know is to do your own DNA testing!

Gina
i don't have a DNA test kit
darn-it

Yeah I don't think Ancestry.com would cover this one