You should expect whatever Apple told you they would be sending. If the rep you talked to did not specify that you could expect anything else than an identical replacement, chances are that is what you will get. It is POSSIBLE that you could get a better-spec'd refurb MBP or even a new one... these things are known to happen on occasion.
Tell us a little more about your situation... was the MBP completely DOA, as in it wouldn't boot or get power, or was it something subtler? How was your experience with AppleCare on the phone? Did you get bumped up the chain to Customer Relations? If so, that's usually where the extras get got 😉
I wouldn't worry about getting 2 DOAs in a row (this from a guy who once got 3, but I digress... 🙄) If by chance it does happen, just remember to be kind and polite to whoever you talk to, and Apple usually takes care of the rest.
Good luck!