I really appreciate the word "would" and "bet". For example, I would bet you "could" be fooled to believe the 4311, 876 were the 7005 if you could not see which one was playing.
Anyway, it is my opinion(only an opinion) that there are ways to compare specs objectively and analytically and try to make some sense, but there isn't much sense in comparing sound quality or how much details each of those specific models could convey to the average public. It is simply too much of a subjective/perceptive matter. For such group of mid range AVRs, I don't believe engineers aimed to design a specific amount of details into their products. They typically design to given specs.