Hi. This video (Raspberry Pi 4 RAM Upgrade - Tutorial) https://www.youtube.com/watch?v=5pW4_nqcIWA is about upgrading Pi RAM from 1GB to 8GB, and it is inspired me to investigate possibility to do this for NanoPI boards. If anyone has any ideas and knowledge, please share it with us.

For example,
NEO4 with RK3399 CPU and with 1GB RAM consist of 2 512Mb chips on one channel (second channel on this board is not used)
K4B4G1646E-BCMA 4Gbit(4096bit/8=512Mb) DDR3-1866 96Ball FBGA.
CPU supports DDR3, DDR3L, LPDDR3, LPDDR4.

There are at least 1GB DDR3 chips out there. (not sure about 2GB, and probably no 4GB)
There is no question that larger DDR3 with same specs should just work (DDR3-1866 96Ball FBGA.)
What about other types, DDR3L, LPDDR3, LPDDR, are they different pinout layout or board design might be incompatible?
Any chip recommendations ?