Thanks just the same to anyone who might have answered this question. A quick search yielded the results. Models since 2019 have switched over to nitro over a CAB coat.
Previously from the PRS Customer Support page:
"What kind of finish does PRS use?
In our history, most of our instruments have been finished with a polyester basecoat and acrylic urethane topcoat. We feel acrylic urethane looks and feels the close to the old nitrocellulose finishes but avoided the issue of future finish checking. Several PRS models, including our Sunburst, Satin, Modern Eagles, and DGT models use a nitrocellulose finish in order to provide the classic feel and tone of vintage instruments.
In 2010, PRS Guitars introduced its new V12 finish. This finish was developed over 12 years, and it is intended as a midpoint between nitro and acrylic with a classic feel all its own. V12 is extremely thin to allow the guitar to resonate, but it is still incredibly durable with no risk of reacting to leather or guitar stands in a negative way."