Is it possible to upgrade 2012 low res glossy to high res glossy screen? I know you can switch the screen assembly from high-resolution matte to high resolution glossy, but can you go from low-resolution glossy to high resolution?

Specifically, if I get a 15" 2012 MBP and take it to an Apple Authorized Service Provider (AASP), can they upgrade a low-resolution glossy to high-resolution (non retina) glossy screen?

I purchased a 2012 MBP with the anti-glare, but I'd really rather have the glossy. So, it seems silly to pay more for a higher resolution screen and then just turn around and get it switched over at an AASP when I could just return the one I purchased and wait for one like I have but with a lower resolution screen.
Technically, it would be possible. 
But apple doesn't offer an upgrade price, so you're only option is buying the screen for the rather high "stock" price. 
Selling yours on ebay and getting a model you want is probably cheaper