Why not? PDX charges a premium for their AP with custom maps. People will want to know what they're getting for the additional expense. If the differences are significant I'm sure it would generate a lot of business for PDX from current AP owners. I'm really interested in seeing how their AP maps compare to their ECUTek maps posted a while back.
Sure you can, but not from different dynos. PDX could easily dyno the base AP map then reflash/dyno with their custom map and publish the results.