More CID by definition means more stroke or more bore. BOTH of those equate to greater generation of forces. Overcoming that with RPM requires a different cam for the little guy.
Yes but by large amounts of just fine tuning opening and closing valve events and lsa ?
I would expect port shape needs to be slightly different also along with intake and exhaust lengths etc.. And stall gearing etc... All this stuff is inter connected so same would be relative term, cause if everything is exact same then it's gonna be mire optimal for one.