AR-Comp is also very close to 8208.
MM
So is AA2460.
kwg
AA2460 is close to 8208 in what way? Burn rate - sure, but so are a bunch of other powders.
Those two are different in just about every other way - charge weights, max velocity potential, temp sensitivity, powder type, etc. 8208 is a short extruded stick powder, 2460 is a ball powder. 8208 is relatively insensitive to temp changes, but 2460 is pretty sensitive at least in 5.56 with heavy bullets.
Maybe you were thinking of a different powder, not 2460?