I'm not ignoring you Karl, I've got the flu and am just not feeling 100% so my mental powers aren't quite tip top.
Uh, first off, though, I'd probably say (and I'm not quite sure why you're asking me more than anyone else about this) that for me, they are completely different. I wouldn't say that in appropriating the appearance of what was originally a working-class style culture, the mock-ska, Dalstonites (who, as you say are largely middle-class, educated people) are aspiring for the same things or looking to express the same things as what you call 'working class types'. By that, I assume you mean an authentic working-class style culture, whatever that is in the current economic climate.
The former is a styling excercise that feels temporary and insincere. Pastiche, really. I would be hesitant to say the same of the latter. I don't see that they 'follow their own fashions in the same way', no. But I'm not looking to judge the 'quality' of them either. I can't see what purpose it serves to put one above the other.