Part numbering for MPC55xx Qorivva series

I was wondering what the M and S stand for and what their differences are. I was thinking multiprocessor vs single? Thank you!
SPC5517SBMLQ66
MPC5510KIT144-ND

Hello jrowanda1, welcome to the Techforum!
It looks like SPC5517SBMLQ66 is just the IC while MPC5510KIT144 is an evaluation board. Unfortunately I was unable to find information on the manufacturers website to confirm if the first character in the part number is referring to single or multi core.

Technical reference number T4457329

Heres the part builder for MPC55xx MCU’s.


Source - Product Numbering Information (nxp.com)