someone posted a comparison picture in one of the SO 100 tooth threads and the new one didn't look significantly bigger than the 80T grip. Maybe 10%?
If they discontinued the old grips, then the new would have to be backwards compatible; if not, they'd have to give you a new $100++ ratchet when your $5-10 (their cost, mostly tooling amortization cost) grip was worn out. I wonder if the old tooling was at end of life? Because I'm guessing they're not making one grip at a time, probably 20+, so the molds are probably >$100k; they wouldn't just make a minimal change to replace perfectly good tooling.