Comparison
This is only a spec bump (again).
Faster GPU (not surprising; see A15), higher RAM ceiling, 50% faster memory bandwidth (LPDDR5 instead of 4X? Maybe it only applies to the 24 GB config, in which case it's three chips instead of two), more hardware video codec stuff (see M1 Pro and A15), same display, same measurements, same camera, spatial audio support added, better headphone jack.
Minor but perfectly fine update, a year and a half in.