I don't really know. Probably yes, since many alt cases interchange, but don't know for sure and that's just an odd enough mounting to maybe have gotten a new rear as well.
I'm sure someone will know though. Give it a little more time in case they're gone for the weekend.
Presumably then, you can't return the one you already bought?
If not, then how are you planning to get the front half of a new one anyway, without actually buying a new one? If that's the case, then you could just use the new one whole.
Unless you're thinking of finding a super deal on a unit that's maybe not working well, just for the case? That would make sense I guess.
Is your current one new or used?
Maybe you can sell the existing one, get a 4, 5, or 6G (whatever they are) from an Exploder and be done with it for less hassle.
Good luck either way.
Paul