Yeah, most of their chips have two or more bins with different core configs, and the lower bins probably use salvaged dies.

For example the regular M4 can have 4 P-cores / 6 E-cores / 10 GPU cores, or 3/6/10 cores, or 4/4/8 cores, depending on the device.

They even do it on the smaller A-series chips - the A15 could be 2/4/5, 2/4/4, or 2/3/5.