Same Cubase project,can be opened on mac,then pc?

Is it possible to start a project on a mac and then open it on a pc and interchange?Like the way its possible on Pro Tools.

Yes.
Best way to get everything that should be in the project on both computers is to make a backup of the project at the end of the session, and include all audio files. (if there aren’t any the cpr is the only file you need)
A backup will save every file that is needed in a project in a single map that can be interchanged.
Best practice is also to have the same cubase version on both systems, and if you use vst’s then they should be installed correctly on both systems for cubase to get the CPR file loaded correctly. It the latter is not the case, you could render everything to audio on pc1 and then work the same way on pc2.

kind regards,
R.

Excellent.Cheers