[brian_]

You might try watching John Kelly's Tesla Model 3 and Y Modular Motors video - he talks about the variations of series of motors and mentions the part numbers. I don't think he covers your specific question, but it should be informative, anyway, and I think there are comments from viewers which are relevant to the part numbers.

Edit:
I just skimmed through the comments on that Kelly video, and found this:

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It is interesting you have the 970 motor, those were from the early Model 3 versions. Today, the performance uses the 980 and the long range uses the 990. If I remember correctly, the standard range uses the 980 in the rear with no motor up front. The 990 can be "tuned" with the acceleration boost option for $2k that gives it similar performance figures as the 980.​

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[tesla_transporter]

Thanks for the info Brian.
I remember that video now. I will re-watch it