Are you saying 2 of the same game? Your wording makes it seems as if these are 2 different games and you’re wondering if you can swap playfields between them.
If that’s the case, no. You cannot simply swap playfields between different games. The score motors and relays are all wired differently for their specific game.

However if this is 2 identical games, say 2 Jacks Open Gottliebs, then yes, you can take a nicer playfield from one game and put it into another. This is common, but it’s tedious.

However if you have say a Bally Fireball you cannot put that playfield into the Jacks Open. Even a different Gottlieb like Drop a Card would not fit Jacks Open, each playfield is specific for that title. The exception would be the occasional conversation kids that were made

I'd only do this if it's a '72 Fireball. I can't think of another zipper flipper machine that would have enough value to put this type of time and effort into...

How much will you be into it for after all is said and done? That would be how I would determine if it was worth the hassle.

If you intend to keep the pin, then yes go for it, if not, I would not as you would be lucky to recoup a quarter of what you'll put into it I'd think.

Right on. Unless it is a very special title and I mean very, very special title, it will make no sence financially to do. Shop it out, make the best game you can, and play it would be my suggestion.