Hi Michelle,
The Pure Strength workouts are the closest to the Gym Styles. The Pyramids would probably be next, choosing an up or down premix & going heavy.
IMax 1 or 2 are the obvious choice for IMax 3.
KPC is probably a bit closer to Kick Max than Cardio Kicks, but either works.
I don't have a lot of Cathe's cardio, but the cardio & leg workout in BodyMax is the closest that I can think of. Maybe an IMax if you took out the impact.
For Coremax abs you have a lot of choices. The core work in KPC, Bootcamp & the Pyramids come to mind.
I don't think the High Step workout is in the rotation, but Bootcamp would be the logical substitute.
Stretch Max is unique, you'll need to do your own stretching or pull out a non-Cathe.
You might want to post your question under the Rotation thread to get more feedback.
Debra