Guaranteed the euro lights won't have the DOT side reflectors! But wow failing an inspection, I didn't think that is even a thing to check! Like there are plenty of DOT requirements in FMVSS but states don't call them all out, other than they do probably prohibit changing any of those things. But I suppose that DOT mark on lights is either there or not and an clever inspector could call you out for it.
No idea if plug and play, though function seems the same, the turn signal area is separate in the Volvo lights I don't think they are ever used for braking? That would indicate a good chance it works. From my adventures in tapping reverse lights, I did learn sometime in 2020 the rear lights changed, from directly driven LEDs by the BCM to being a LIN unit controlled by the BCM. That may be a consideration in getting the right parts.