@redbeard is correct. The SRX 2200 is physically no different from a standard APX. The internal frame and external control top and housing are structurally identical to a standard APX 6000 or 8000, depending on vintage and model of SRX. The only noteworthy distinction is that the SRX and all APX XE models come standard with the "rugged" option, which bumps the IP68 submersion spec from 2 meters/2 hours up to 2 meters/4 hours. You have to specify that option with the standard 6000/8000 models if you want it.
As far as the differences between the standard APX and the APX XE models, it's the better IP68 spec noted above, as well as the larger XE control top. Everything below the control top and inside the radio is otherwise identical.