http://incra.biz/Products/TTrack.pdf
the above document describes the Incra tracks, the cross section at the bottom indicates to me that the reg track and the plus track have the same profile/characteristics in the top-facing track portion. the downfacing track in the plus version is for mounting the track.
So I'd say yes, they are compatible if you line them up correctly then parts will slide from one to the other and work with both.

LCHIEN
Loring in Katy, TX USA
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