blitter is probably the only thing which makes games incompatible for ST and MegaST -- but honestly, I can't think of one single game which uses Blitter only (i.e. no STE hardware).
STE/TT are completely different machines which share some common hardware. I recommend you to google STE HW and TT HW description done by Paranoid (for Alive or UCM diskmagazines -- both online now)