Primary NOC Code and impact

I have obtained Provincial Nomination earlier and had my ITA. In my Express Entry FSW Category, my NOC is 2243 - Industrial Instrument Technician as my Primary NOC.
However, due to occupation in demand for MPNP, my primary NOC is not available but I applied with a close alternative NOC 2241 - Electronic Electrical Technician with job responsibilities related to my primary NOC 2243. The two NOC is under Skill Category B and MPNP issued the Nomination certificate with NOC 2241
Now my query is, Post ITA, the Primary NOC on my PR application is showing NOC 2243, I want to ask if I should maintain this NOC 2243 and keep Work NOC as 2243 or Must i can change both Primary NOC and Work NOC to align with NOC 2241 on my PNP Nomination Certificate.
Please, note that the Employment Reference Letter I used for the MPNP has Job Titles as NOC 2243 with overlapping job duties as NOC 2241.
Am in a dilemma now with my eAPR application to CIC and need your urgent advice.