Issue 1: CPP’s application chart is completely useless. This is just their stupid way of saying those are A-body UCA’s with the large upper ball joints. So an 73+ A body UCA is the same thing. B/E bodies used the same large upper ball joint at the 73+ A bodies.
Issue 2: I’m pretty sure that the pins are the same, I have definitely swapped pins between calipers that were from 72 down and 73+. Or at least were advertised as such, so, maybe that’s not a good indicator. The pin style caliper brackets are definitely interchangeable ‘70-72 and 73+, because I’ve run early calipers on the later 11.75” caliper brackets for a rotor upgrade.
And yes, you can use the slider calipers on those spindles as long as you have the matching caliper brackets, which you appear to have.