My bad, I've had a horrible day. Not that it's justified, it's not the OP's problem it's mine. My apologies, I was out of line. The OP was right.
Actually she discovered a technical issue. This stuff should be interchangeable and tech should not have to dig around for specific models & mfg codes. Even Directv CSRs will not promise specific equipment. There has to be a technical reason why only a certain receiver will work with some TVs. Someone on the DirecTV side should figure this out and make it go away.
Joe