This gets discussed here from time to time. The conventional wisdom is "no difference" and that comes from Alistair himself, plus end user reports. However, even in the carbon fiber world it is very difficult to make two guitars exactly alike, so some minor tone differences is certainly possible - just rather unlikely.
We happen to own two different X7 woody's (one koa, one bubinga veneer) and there isn't any difference that we can hear between those veneers. We do not have a with/without pair of the same model to directly compare though.
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