Go to the Wilson Combat web site here and scroll down to the bottom where they tell you what the TTU fire control unit fits and what it doesn't.
Bottom line: Yes, DD and WC both use .154" hammer & trigger pins.
But for the same money or less you can get a Geissele (or even a Jewel) which (in the opinion of one or two of us here) are just about the best you can get.
I've only fired one Geissele trigger and it's the one in my AR (Hi-Speed National Match DMR). I've fired a lot of guns and without a doubt, Geissele is in the highest tier of the upper most echelon of everything that is the bestest.
The barrel and trigger are the two most critical parts you can upgrade which will have a direct impact on accuracy. WC makes great stuff, but IMHO buy a trigger from someone who specializes in triggers. Bill Geissele is supposedly a competitive shooter himself. Who better to design and manufacture a trigger?
On another note. I think Colt is the only manufacturer that uses a different pin set and I don't think that is in every case.