If all that changed was the head then he and the eng were lacking. If the only variable is the head and the guy sold the drum after that, how skilled could he really be? Seriously? It's not rocket science.
I don't want to come across as insulting the guy but this makes no sense. If you love the sound of the drum and you change out a head and then don't love the sound - to the point of selling the drum ... that's either lacking skills or a spoiled brat. I would prefer to consider the more mature route. If the head doesn't sound right, you tweak and tension until it does. Or you change heads as it could be a faulty one. But to sell your fave snare because of a head change ... thats just plain silly.