Yeah .rpp and .wav are cross-platform. It used to be that Mac’s file system was different from windows so that a disc written on the Mac could not be read on the windows machine (and vice versa). I’m not sure that’s even true anymore, but as long as you can get the files back and forth one way or another, it’ll work fine.
Just in general any third party plugins used will have to be installed on both machines, and I guess there are some plugins that are platform specific. But I mean that’s only really necessary if you’re actually using the plugins on both machines. You don’t necessarily need or want all of the plugins you’ll use for mixing in the tracking project anyway, so it might not even matter.