well, there are a few differences... like I mentioned it is probably not cannon to stick the D and P on like that,,,although I wouldn't mind...
Take a look at the bridge betweent the two, on the DYRL version it is positioned in the middle of the raised hull section that it sits upon.
The forward nose section is raised about a two thirds towards the front, top section as opposed to flat on the DYRL version. The nose section if you can call it that is different.
Looking at them in attack mode will show some more difference, like the thruster section (feet area) etc.
Anyway,,, I am still hoping that they might release DYRL compatible D and P's.