Other than the bolt pattern difference, is anything different between the two dizzys?

 

I'd have to say no since LS dizzys can be modified to work on a vtec engine. I've also read that even single cam internals will work in a b-series dizzy.

Bolt patterns and OBD changes seem to be the only differences. I just tried putting an obd1 vtec dizzy on an LS engine and only 1 bolt hole would line up, ended up just finding an LS one.