Alistair P said:
Your accent comes from where you're brought up, not your genes.
WARNING - SMALL SPOILER AND SAD LINGUISTIC ANALYSIS AHEAD
True. One's idiolect, including one's accent is affected by a variety of post-natal influences. Your accent can be shaped by the locale of your birth/ childhood; the accent of your parents/ guardians (and presumably not all the clones would have even met Jango); even the media you are exposed to (consider the kids in England today who have all acquired Australian Questioning Intonation? Where everything they say sounds like a question? Like in Neighbours?); your peer group, and lots of different things like that.
While Boba is presumably raised exclusively by Jango, up until the latter's decapitation, the clone army doesn't seem to have this close familial influence on their accent - they're pictured all being raised collectively in the cloning factory place.
Anyhow, in spite of this, I still don't think that the Stormtroopers are the same as the Clone troopers. Any army, however efficient will take casualties, and no-one in AOTC mentions anything about ordering any spares. So presumably, after a sizeable chunk of casualties are removed from your original run of clones, you'd have to start conscripting or enlisting new troops, of all kinds of hights, backgrounds and genetic make-up.
I know there's a milion-odd clones, but in the intervening couple of decades of conflict between Episodes 2 and 4, you'd easily go through those. The Stormtroopers ain't clones. In fact, can I even put in a prediction that in Episode 3, the cloning facility is destroyed?