Yep, roadworns have Tex Mex pickups.
My ITs were originally in a dark/mellow sounding strat, I probably should have bought Mothers Milks for that one (it was my first set of BKPs). I loved what they did, but the guitar was a bit thick sounding for some of what I wanted.
When I got my 60s Roadworn, I loved what it did... but it was lacking a bit in body when amplified. Lovely sound, but not quite what I was after. So I swapped the pickups between the two guitars. The ITs in the Roadworn nailed it - woody, but with a bit of grunt when you dig in. And I use the bridge on its own quite a lot. (And actually, the Tex Mex in the other strat sounded very similar).
The two Roadworns I have are both bright and resonant guitars - I've tried the original Tex Mex, and IT/Sultan/Apache from BKP in them. None of them are a fail, but my favourites are IT in the rosewood, Apache in the maple - both options seem to be classic "blues or rock strat-player" tones in my experience (Gilmour, Rory, SRV, etc, etc).
I haven't tried MMs, but I've learnt that they are brighter than the ITs - the ITs have a little extra thickness to them. So, for me, I don't think the MMs would complement the brightness of the Roadworns quite as well as the ITs.
If, for some reason, you've managed to lay your hands on a "darker" sounding Roadworn (and I haven't played one, strat or tele), then I would be thinking MMs are possibly a better match to get to the same place.
