Chosen Solution

I have a 2012 2.6GHz MBP with hi-res anti glare display. The motherboard died recently. Can I replace the mobo with one from a non-hi-res 2012 2.3GHz MBP?

Yes, you can! But you’ll want to replace it with the better board MacBook Pro 15" 2.7 GHz i7 (Mid-2012) as it had the deeper memory for the higher res your display can handle.