No. As I see it, they are not the same people.
Man United fans did speak up about everything that effected their club, there was those that spoke out in 91/92, and they spoke out about the use of sweatshops to make their kit - there is an element to united that has spoken out about all of these things - of course, there is an element that has not - the dick down the pub with the new replica shirt every season who couldn't find OT on a map - but they will continue to 'support' the club at M16 - but then there are those that have decided enough is enough, they spoke up when the EPL was dreamt up, spoke up when murdoch came to town and spoke up about a lot of things - it was painfully obvious that the custodians of the club couldn't give a shit either way - as long as there were money spinning tours and market opportunities why would they, they can always fill OT with more customers - so, that element left to form FC United
Maybe they should have walked in 92, maybe later i don't know why but i would guess its something to do with the fact that it isn't to easy to do what looks to many like walking away from your club, but now AFC have shown it can be done - AFC gave a HUGE amount of support to FCUM in the early days and i think still are - so now the fans are having a say that will be heard by the club. Its not just about glazer, but rather the culmination of a list of problems that have been brewing - the custodians at M16s biggest NikeStore do not represent them or what United means to them - so that left one thing to do...
They will however continue to represent the kids in towns around the country where the local teams do not do what they can to attract the local kids, will continue to represent the dick in yer local with a replica shirt who has never been and continue to represent day-trippers OT to spend money in the mega store - because thats what it is now all about.