Another mcor question

I am getting the jerkiness at half throttle on my 2012 Precedent and it looks like I need to replace the MCOR. I have read the various threads on here but I'm still not sure if I need to buy the MCOR 4 straight up or do I need the conversion kit? From what i read, it looks like if I have the MCOR 3, I would need the conversion kit whereas if I have the MCOR 4 it would be a direct replacement. Do I need to tear into it and see if I have an MCOR 3 or the MCOR 4? Thanks in advance.

Rex