From the article about the instruction set: > This is believed to be identical to ARMv9.2-A without Scalable Vector Extension (SVE) supported by M4 P cores, en

From the article about the instruction set: > This is believed to be identical to ARMv9.2-A without Scalable Vector Extension (SVE) supported by M4 P cores, enabling the same threads to be run on either core type. It also explicitly mentions half of the processing units per core and lower clock speeds.