Interestingly enough.. this was discussed at the meeting last night..
The CLub president, an old school beekeeper said that it depended entirely on the comb and its age and use.
Old black comb with cocoons would darken the honey and perhaps give it a more bitter taste. Combs used a little, but not yet very dark didn't seem to make any difference.
I have stolen honey comb to use as brood comb, but I haven't used brood comb as honey comb, so beyond the statement above I have nothing else to base a comparison.
I have read, that not using an excluder, a queen will sometimes lay in a honey super, but that by the time the super begins to fill with honey and be capped, that brood will have emerged, and the cell will be back filled so there is nothing to worry about... my thought in reading that, was of the coccoon. Varroa trapped between coccoon and cell wall, and the Varroa defecating in the cell, and my mind said... ewwwwwwww