Moved to appropriate forum...
Define "regular" as there are 4 variants total on the 1520 model.
The RM-938 Latin America is the 1520.3. The RM-937 International and RM-939 WCDMA should be identical. The RM-940 ATT lacks Qi and has contacts for a Power Mat charging jacket but would still fit.
What's the game plan?
There are a lot of threads in the 1520 forum about swapping shells. You might want to peak at some of them for your specific cross use.