I've been able to find dcp files for Adobe Standard and all the camera emulations as well as user added profiles, but the ACR 4.X files remain a mystery. Where in the world are they?
My first Canon DSLR camera has ACR 2.5 (or maybe 2.7) and ACR 4.4 profiles along with the standard DNG Profiles. If there is more than one then it is the vintage of ACR when the camera was first supported and any intervening profile corrections before ACR 4.4 improved on all of them. Basically you need to support all profiles back to the first version of ACR that supported RAWs.