The GP ("Grand performer") shape looks like a Taylor x14 (GA).
The OM looks like a typical Martin OM with cutaway.
A simple way to explain it is that the GP's cutaway is more "pointed"
I have a OMCPA4 on the way. I was first smitten with the GPCPA4 but that's before I played the OM. The GP is just a bit too in-between. The OM to me is more focused and typical Martin.
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