Hi anthony no they use different kernels, the part that is the same is they both use the .3dm file format as the main "native" format. But that's just for data storage not for any modeling calculations.

It is pretty useful to have both available, they each have different strengths and weaknesses. But yes many Rhino operations can tend to fuse segments together though which can be problematic. I've tried to avoid that with MoI.

With them both using the same storage format you can move objects back and forth between them easily.

- Michael