Specs are the same, the APU is just now 6nm instead of 7nm which lets it run a few degrees cooler and therefore boost a bit higher without overheating, and the RAM bandwidth went from 88Gb/s to 102Gb/s.

Consensus seems to be somewhere between 5-10% better fps, which means a game that ran at 50 fps might go up to 55, or one that ran at 28 might finally hit 30.