the differance in barrel life between a fast twist and a slow twist would be smaller than to barrel in the same twist from two differant makers , nothing to worry with.
As far as fouling goes , if its a quality barrel then fouling woun't be an issue with the twist rate more along the lines of how hard you drive that 55 gr pill , you try to get 4200fps out if it and it will foul and wear the barrel , be happy with 3900fps and you'll be happy with the fouling and barrel life