Randy:
They are different bushings, with different part numbers, different prices and different diminsions. SO, according to PSI, they ARE different bushing.
Can you use the Slimline Pro bushings to make the Artisan Click Pencil. My answer is, YES, provided I have a caliper! The Artisan bushings are "collar" bushings. IIRC, the Slimline Pro (at minimum, Slim bushings) are "jamb" bushings that friction fit to the butt of the tubes. I CAN make them work! WOULD I WANT TO? YES, if I needed to make the pen, NOW and didn't have the Artisan bushings.
Respectfully submitted.