I think Earl pretty much has the right of it.
I have 2 Taylor Grand Concerts, a 512ce L10 all mahogany GC and a 412e-R SE sitka/rosewood GC.
The 512ce L10 (Limited #10; they stopped putting a number on the Limiteds after this) has a few more extras than appear on a standard GC at the time. And the 412e-R SE (Special Edition) is about the same as it's ovangkol brethren except they used rosewood (the '-R' in the nomenclature) instead of ovangkol for the back and sides. The next year, Taylor dropped the 'SE' for this model but continued to make it.
This falls in line with what has been previously noted.
But of course, none of this is set in stone. Marketing, you know.
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Earl, I graduated from Boston College which is run by Jesuits. They don't assume that they're right. They
know it.
And they teach it that way and promulgate this belief to their acolytes. Of course they do tap into a higher power, you know.

Don