Thanks animagic I really appreciate the fast response!
My issue specifically is that I am seeing a discrepancy between how character models export from CC4 even with the same export/import settings.
For both Coyote and Camila I am exporting with the Y-Up setting:

However one comes into Maya with the OrigShape down and the other with it up the correct way:

This is an issue in our pipeline as we want to receive exported CC4 assets from clients and put them straight into our custom engine without intervention, but that requires a trip through Maya.
Currently I see no way for us to predict if characters will import correctly when the system is automated.