Yes, that Winbond is probably it. It's described as an "LPC IO" which is for your BIOS chip--not your SuperIO controller. That'll probably be another Winbond chip of a different model elsewhere on your board. We have similar controllers, actually, so I imagine there's a good chance of it working with the SST.

Yours is a W83627EHG and mine is a W83627HG. Not sure what the difference is atm.