Does unequal speaker wire length matter?

Please don't try to "get away with it" - as you coined it. Different length might be without consequences in a MidFi system in a bar or so. Maybe you could "equalize" it with some balance settings in your pre, maybe in your case the difference is in such a short range that it might be tolerable, but we are talking high end here, right? And in that field especially the little things MAKE a difference.
Good luck!

Timing will be off resulting in a loss of soundstage and imaging. It will be similar to listening to a system that is wired out of phase. It could be bad enough that you would be better off with a boom box.

Lamp cord would be a better option than two very different lengths of cable.

At that length timing has very little to do with it. However, resistance is different over those lengths, which does matter. Sorry.