Yay, indeed. That saved you TWO huge headaches and at least $600!

If they're NOS, I could see those prices. But for used, that seems a bit high. The gumball machine in nice, used, working order can still get up pretty high, though.

If you've got the complete set of boards, it might be nice to get the whole thing up and flipping on the old playfield to ensure that you've not only got everything parts-wise, but have installed everything correctly, and that it all works as it should. If you were a dmacy or @high_end_pins, aka a playfield swap expert who's done tons of TZ's, I'd say just build it on the new one. But since you'll probably also need to drill out some holes on the new playfield as well as some other adjustments here and there, having the old one fully built and seeing how something is supposed to be installed(i.e. from the factory), it'll make it easy to make those corrections as you're transferring things over. To know for sure how something was done from the factory and see the difference that might be on the new playfield and being able to correct it is quite a valuable resource to have.

Just my 2 cents.