No, they don't look all the same: different colors, different morphs, and even if that's the same for two, they always look slightly different. Like there are always differences in two dogs of the same breed.
I rarely see another beardie in person, but when I go to the reptile store here, usually at least one of the beardies of the store owners is there. The one that is always there is three months younger than Taco, should not make much a difference anymore, but I immediately see that he doesn't look like Taco - that dragon has, for example, a bit a rounder face and its neck shield is smaller than my Taco's.
Here in the forum I found sometimes a lookalike (Kai looks quite a lot like Taco), but I'd bet in person I would see slight differences.