Engine Mounts for LS series- are they the same for LS3, LS7, LS9, etc.?

Definitely a newbie question, but I have to ask- if I put an LS3 in to an SL-C, and later want to upgrade to a different LS engine, do the engine mounts remain the same? Is it a matter of simply dropping in the new engine? i know "simply" doesn't describe it, but do I need new engine mounts for a new LS?

Yes they are and our mounting system makes it very very easy to swap engines...