well that would be really stupid if SE didn't decide to either not give refunds for people who registered the EA code and then cancel. most retail game stores wouldn't allow refunds for games that have their codes registered already.

also, the EA code isn't the actual code, but it still sets up the same layout in mog station if you go see. i have "service account 1" as my EA code, and "service account 2" as my CE code. they're essentially the same type of code with only certain service options opened. the CE code has subscription payments open whereas the EA code doesn't. i'm pretty sure it's not that hard to enable subscription on an EA code in mogstation.