Well, Part Numbers and Feature codes are always difficult to compare and/or map.
The closest I can come without too much sweat - when confronted with a similiar situation - is to use the command lscfg and note the FRU/PRU number and use that for searches elsewhere.
The PRU can change overtime, but the FRU is meant to be a constant for a particular model.
From an older system - an example from a hard disk where both part number and FRU are listed.
Hint: Just try lscfg -v for a listing of everything
# lscfg -vl hdisk0
hdisk0 P2/Z1-A8 16 Bit LVD SCSI Disk Drive (4500 MB)
Manufacturer................IBM
Machine Type and Model......DDRS-34560D
FRU Number..................83H7105
ROS Level and ID............44433247
Serial Number...............RD5L1296
EC Level....................F21977
Part Number.................22L0352
Device Specific.(Z0)........000002029F00003A
Device Specific.(Z1)........21L9832DC2G
Device Specific.(Z2)........0933
Device Specific.(Z3)........0799
Device Specific.(Z4)........0001
Device Specific.(Z5)........22
Device Specific.(Z6)........F21420