.45 AR Question

I bought a Redding 93189 flaring die today since my Lee universal expander will not reach the .45 AR case, and barely flares the .45 acp. I suspect there's a difference in the shellholder due to the wide rim of the AR.

Now my question is: What is the difference between the Redding 85189 Taper Crimp Die (which is what I think is in my Competition Carbide .45 acp die set) and the .45 AR Profile Crimp Die? Well, I suspect the latter is for the AR specifically and is not designed for a case that headspaces on the case mouth. But the Sinclair website shows that die for both cases:

http://www.sinclairintl.com/1/1/8208-redding-profile-crimp-die-45-acp-45-auto-rim.html

Midsouth shows the die for the AR only...

http://www.midsouthshooterssupply.com/item.asp?sku=0007686189

The Profile Crimp Die taper crimps prior to roll crimping, so you get both in one.