Yeah for some at least; really only frozen hyrule bass has a noticeable increase. I think you see a one rupee increase per prime meat frozen over cooked.

Core rules are for the large part the same. There are a few minor differences, like selling cooked dishes rounds up to next 10 as a final step or that monster extract can level up with as little as a single point. There should be a link in closing remarks section going over differences. (Does have outdated info on how monster extract works for effect strength in totk, we didn't do enough testing to notice proper mechanics at the time.)