scale difference in photoshop and painter

apologies if this is a very basic question--

I have a sketch here I did in Painter (of an 80's line of dungeons and dragons action figures) -- visually sizing the canvases the same on the screen but photoshop (Left) is at 66.7% zoom and Painter (right) is at 33.3%

I've been sketching in Painter for years and embarrassingly never noticed this discrepancy.  Do I have something set up wrong in either program?