I tried being a little fancier but still didnt get any closer. I ordered a custom mixed spray can (was like $20) in hopes of matching the calipers perfectly based on this paint code:
https://www.focusrs.org/forum/17-focus-rs-appearance/55073-paint-code-rs-blue-2.html#post1284273
My plan was to spray a base of engine enamel, I used the Ford blue as mentioned above and it was close. Then i did a couple coats of custom paint followed by high temp clear and then baked/cured per the clear instructions. Still not a match, from the sample card, i should have gone with a white base vs the dark blue. Again, the front/rear calipers will never be photographed again next to each other and its close enough. On the car, no one pays attention to the rear single pistons when you have a brembo up front
Depending on the lighting, it was close to not a matching, not worth effort of doing multiple layers. The paint has held up though, i was worried about temps and the custom paint not being a high temp paint but my sandwich approach and proper curing seems to be tough enough for the heat that rears see.