I'm interested in what you guys find out. For what it's worth, my '17 Mtn Cat has a Team primary and the spring has "49205085/255" stamped on it. I would assume that this would be the Cat 85/255 spring, part no. 0646-471 from the 2016 M sleds. According to the parts fiche, my sled is supposed to have a 105/225 spring, part no. 0646-940 in it. I haven't touched the primary from when it was new at the dealer. Maybe the dealer put this different spring in...
I can believe that the spring is a 85/255 since the engagement is so low and smooth. Granted my sled is running the Zuke and the Team primary before they went to the one with bearing... I'm guessing both versions of the Team clutch might accept the same springs. This spring might not be heavy enough for you, but I love the low engagement.
Looks like the 2020 600 Alpha runs this same primary spring too.