Unless the HBOE was off the old channel 70, which should no longer exist, they should be almost the same.
Each transponder holds 5 HD channels, so bandwith is adjusted real time. If all 5 channels on a transponder had demanding content at once there could be slight reduction in quality by the encoders (hypothetical based on my understanding of how it works).
If later in the day the HBOwest transponder was sharing with say 3 of 4 other channels showing just SD programming with black bars that would be less demanding and the encoder would use the extra bandwith for the 2 HD channels (again, just based on my understanding, may not be correct).
That's the only way I can see them having different PQ.