I have the M1 Pro with (8 + 2) cores. But seeing as the cores are identical I suspect with the base models with (4 + 4) cores you'd see very similar performance

I have the M1 Pro with (8 + 2) cores. But seeing as the cores are identical I suspect with the base models with (4 + 4) cores you'd see very similar performance except you'd be looking at 5x rather than 10x on multicore workloads.