The S2 3 way switch is way nicer than an SE switch. Both of my guitars are 2019; the SE Mira switch feels cheap like it won't take much to break compared to my S2 Custom 24. Nut on both have been very good, the SE Mira may come with a better nut than most SE models. Pots/push pull seem equal. Knobs on the S2 are significantly nicer. I have different bridges so can't compare, pickups are the same, and I would say the 85/15 S are pretty good stock. Might change them on the S2, if/when I get a third PRS, and want something different.
Do you happen to know if the pickup rings (ivory cream ones) are the same between the S2 and SE? Thinking of going with the US ones which are less yellow and more ivory/whiter.
Did the US core models ever come with a push pull pot? I'm not sure if the one on the PRS store is an upgrade at all for the S2 if it doesn't come on US core models.
https://us.prsaccessories.com/products/push-pull-tone-pot