Mating with the 770530-1 pin
The 770529-1: Both parts share the same wire range and plating, so a mated pair uses the same crimp tooling and wire preparation.
Bulk vs tape-and-reel packaging
The 770144-1 is a bulk-packaged socket contact with the same 14-20 AWG range and tin plating, offering an alternative to the tape-and-reel 770529-1 for hand-load operations. The 770146-1 accepts 18-24 AWG wire, narrower than the 770529-1's 14-20 AWG range, while sharing the same tin-plated socket contact form factor.