There is a TM that explains the process.
It is a paint by number thing. Brush, roller, spray gun, broom, sponge, and derivitives/combinations thereof.
I have seen rigs come in (at Idaho Motor Pool for example) with some of the best and worst looking patterns and applications. So technically speaking, would it not make sense that any "quality" of camo paint job could be considered "accurate"?
To take it one step further, the specific pattern is determined by that TM. Even that says there is a margin for error. So I think the only constant should be the color. And with that being said, there are volumes of threads on the variations of that, too.
It boils down to whatever trips your trigger. Within reason. (Bright purple and orange, in a checkerboard digital pattern is going to raise some eyebrows.)