Thunderbolt 3 aic- generically compatible yet?

[NattyKathy]

I noticed that some ASRock X570 boards tout TB3 compatibility (fracking finally AMD users get to join in the fun). If a board has the TB3 header and firmware support, does that mean we can just toss in any old TB3 card, or are we still stuck using cards from the same mfgr as the mobo?