[kg]

IIRC modern Apple devices integrate the memory into the whole SoC instead of making it separate on the board and replaceable. It's definitely not swappable like a DIMM or CAMM module would be. Can't find a photo of a decapped M4 chip to prove it, though...

[MadnessASAP]

Its not integrated to the SoC, it is soldered to the mainboard though.

[theshackleford]

The memory is not integrated into the SoC die itself, but it is packaged alongside the SoC rather than being separately mounted.