[ryanmk]

Can other computer-on-modules in a SODIMM package be used in the Compute Module IO Board they are developing?

I've searched online, and I think the boards that the SODIMM modules are plugged-in to are called "base-boards" or "carrier-boards". In general, are these kinds of boards generic in nature, so that you can mix-and-match modules with different carrier-boards, as long as they all use the SODIMM package?

[kbaker]

No, usually each manufacturer has a custom pinout for the SODIMM connector, they are not interchangeable.

For that you may want to look at the Qseven standard: http://www.qseven-standard.org/

This also gives you a bump in processing power as well, with the ability to use ARM or x86 processors. (of course it is a lot more expensive...)