Yes, NAND is "married" to CPU. The per-console key that decrypts bootldr in the NAND is embedded in the CPU. It would have to be the CPU + NAND from the same model PS3 though. If the contents of the EID doesn't at least match the motherboard, it could lead to issues.
Originally Posted by H3rman
Example : Transplant a CPU + NAND from a DIA-001 motherboard to a COK-001 motherboard = bad.
You copy the contents of the original NAND to the second one.
Originally Posted by radoslav81
PS3 Slim CECH-3004A 160GB
PS2 Slim SCPH-70004 - FMCB 1.8b