For the LPDDR4 and LPDDR5 that goes into the M1 and M2/M3 systems, yes. You might need to spend more money on memory controllers (since M1 and up is 8-channel)

For the LPDDR4 and LPDDR5 that goes into the M1 and M2/M3 systems, yes. You might need to spend more money on memory controllers (since M1 and up is 8-channel) but the physical memory component itself is highly availible and relatively cheap. Same goes for SSD storage, nowadays.