Well it's quite different from the M1. Please don't mix it. It like saying i3 and i7 is the same if they are on the same generation.

It's not that different. It has more cores but they're the same cores.

And higher power limit, exactly like i3 and i5 and i7. Same core architecture, just different in clock, power and core count.

I think they have the same microarchitecture but are slightly different (in, like, the number of address bits)