In terms of sound only, should I expect to hear a difference between a cutaway vs none cutaway in the same wood's and body size? Say a 514ce vs a GA5?
This is one of those things asked over the years, and the answer seems to be a resonding no ...at least all that I've read. Think of it this way: there are simply too many variables in the making of a guitar that differentiate two guitars from one another, even when "all else being equal." The cutaway
alone just doesn't play enough of an audible role that we can hear.
The other question your raise, hearing the diff between Taylor's Acoustic elec and their Acoustic-only line, likewise is another thing many folks wonder about. Here is where all those variables in build and materials I alluded to, in sum, really can make a difference in the final tone of siad guitar. So the short answer to this question is
every guitar sounds slightly different from each other ...some differences are simply more or less audible than others. Hope that makes sense.
EDIT: ok, Chad beat me to it ...but you get the point
Edward