I have 3750G-24 TS and a 3750-24TS (non-gig)
Can I stack those two different kind of models? Never done it before and it seems it would be odd since it would be 24 gig ports and 24 FE ports.
See the second link I provided. The major version must match, but you can have minor revisions between the two. You must force the mater to push the IOS to other stack memeber it does not do it automatically.