The AR is a relatively accurate platform compared to a lot of semi-auto rifles. The barrels in those rifles themselves should be 1.5-2 MOA shooters assuming they're just regular chrome lined barrels (not stainless) and in good working order. The Colt Match HBAR is obviously most likely to be the more accurate of the two, but by how much, I have no idea.
Bear in mind, most surplus ammo (M193, M855, etc.) is only good for roughly 2 MOA accuracy, so you have to factor that into the equation as well.
The biggest variables in practical accuracy are the ammo you're using, the optic you put on the rifle, and of course the shooter you put behind the weapon.
Long story short, if you have a capable scope, a good shooter and match ammo, I would expect those rifles to do 2 MOA or better (2" at 100 yards, 4" at 200, 6" at 300, etc.).
And like someone else said, you really just have to shoot the gun and figure out what ammo works the best in it...all we can really do is speculate based on what we've seen similar guns do.