elbee!
The whitish blue Echeveria on the right looks like a cultivar of Echeveria runyonii called "Topsy Turvy". Take a look at some pictures and see what you think. The leaves have that same folded look.
Echeveria (Echeveria runyonii 'Topsy Turvy')
The plants look like a good match for the size of the pot at this point. All 3 have the potential to grow and clump and take over space but not for a while. Maybe repot in spring when the light is stronger. Speaking of which, try to give these plants as much light as possible (right by a sunny window is ideal)... especially this time of year when shadows are long. None of these plants will experience any kind of seasonal dormancy given room temperature conditions and good light.
Mixing plants from different places is never a problem. Ideally you want to group them by how much light and water they prefer, so that they are compatible care-wise (like your plants).
