IMO,it does if you ever plan on selling them...cant comment on the sound diff
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Unfortunately I think you better pony up and go with the Avalon sourced pair. In addition to pair matching, there are other modifications that Avalon does in house that are part and parcel to the crossover design. Now if you can find out exactly what the modifications entail, but they may not divulge that.
I would email Accuton. If the mod is mechanical..ie adding mass or something to change cone rigidity, then they will sound differently. I have seen so called modded parts that had no more than a resister glued to the frame. My guess is that you need to get the Avalon mids, but I would email Accuton and find out.