Are there any differences in these kits? Thanks.

They are completely different versions of the M-47 so I'm not sure why you are asking?

M-47/G is the original, standard M-47, the G parts are simply to make a West German version with minor changes to handrails and smoke launchers.

M-47E/M is the modernized version with a completely different engine deck similar to the M60A1 since it was re-engined with the same diesel. The new engine also means new rear plate, air filter boxes on the fenders, different exhausts. Some other minor changes as well.

So the kits are very different.

But did they actually change the kit parts to represent the changes. I only have the G

Yes, they did change the parts. New engine deck and new rear end.

Slightly related, you may like this thread as well:

http://www.armorama.com/modules.php?op=modload&name=SquawkBox&file=index&req=viewtopic&topic_id=285248&page=1