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Nathan, the actual CX4's are actually functionally the same. The mixture is as you state, a combination of "State Restrictions", Qualified Professional and Standard Fare. Same firearm, different accessories or earmarked for QP.

The Cx4 Storm was developed to be used in conjunction with Beretta semi-automatic pistols. For example, the magazines for the Beretta 92FS chambered in 9mm can be used in the Cx4 (also chambered in 9mm). This aids in a smaller loadout – no longer needing to carry separate magazines for the rifle and handgun – and adds redundancy, allowing a person to carry more ammunition without adding weight. Conversion between Px4 Storm, 92/96 and 8000/8040 Cougar 9×19mm Parabellum/.40 S&W magazines requires two parts (not included with rifle). For Px4 magazines the C5C620 magazine insert and C89210 magazine release button are required, for 92/96 the C5A511 insert and C89109 release, for Cougar the C5A670 insert and C89110 release.[2] The .45 ACP model only accepts 8-round single-stack 8045 Cougar magazines. The CX4 Storm includes a Picatinny rail that can be extended under the barrel by pushing in the sling button and pulling the rail out by a thumb tab. Each Storm also includes a side rail with tw

10 round vs 15 round between these two. And the best way to get the actual model#s (90, 8000, etc.) Is to match up the UPC with Berettas website.