Well, yes. Usually, Pokemon are larger than their counterparts from my world and have some sort of elemental affinity, but there does seem to be a consistent pattern. For example, Hoothoot and Noctowl are owls, Mareep and Flaafy are sheep, and so on.

Of course, occasionally I have absolutely no idea if a Pokemon has a counterpart in my world or not, but for the most part they do.