The Roadworn 50s and 60s bridge are the same - at least, they look, and behave, the same on my two :lol:
ITs have done a superb job replacing the Tex Mexes in my 60s. One first changing them, the difference wasn't huge at all. The ITs seemed to provide just a little more body than the TMs. And then add the usual "seems more expressive" that you get with BKPs, volume and tone controls more usable, etc...
Sultans into my 50s was a slightly different experience. I very much like it, but I'd say ITs are nearer to the Tex Mexes out of the two. The Sultans have just as much top end but seem sweeter/rounder sounding, the ITs can get harder/tougher more easily. (Both sets have been in the same strat before they ended up in the Roadworns, and the hard/sweet comparision seemed to apply in there as well - but it's all a bit subjective, different strings, several months between the changes, etc)
The 62s and Mothers Milks (both of which I'm considering next) I don't have any experience of yet... but both the ITs and the Sultans have a superb bridge pickup - I somehow suspect now that none of the BKP strat sets are going to have an unusable bridge pickup for me :lol: