What kind of errors? Compiler errors? Linker errors? I have a project that develop on 6.3.2 and transfer the result over to 6.5. I get some compiler errors and/or warnings because the 6.5 GNU compiler is later. These have always been easy to clear up, and they are backward compatible to 6.3.2.
I would excect lots of error. Eclipse config files for projets are not backward compatible. Would you expect Visual Studio 2010 projet to import in VS2005? Maybe if you were more specific about the error somebody would be able to offer some help.
Sorry, I thought he was talking about PhAB. I see I read it incorrectly. You are right, he's talking about Momentics. That's what I get for answering questions too early in the morning.