Possibly, at least compared to the previous M4 generation. For the lowest tier M models to this point:
M1 (any): 4P + 4E
M2 (any): 4P + 4E
M3 (any): 4P + 4E
M4 (iPad): 3P + 6E
M4 (Mac): 4P + 6E
M5 (iPad): 3P + 6E (claimed)
M5 (Mac): Unknown
It's worth noting there are often higher tier models that still don't earn the "Pro" moniker. E.g. there is a 4P + 8E variant of the iMac which is still marketed as just having a normal M4.
The die shrinks are less than the marketing numbers would make you believe, but the cores are getting significantly more complex. I think E cores had a 50% cache increase this generation, as an example.
The above summary also excludes the GPU, which seems to have gotten the most attention this generation (~+30%, even more in AI workloads).