929500-01-20-RK vs 929500-01-20 vs 929500-01-21

PartNumber	929500-01-20-RK	929500-01-20	929500-01-21
Description	Headers & Wire Housings .100/.295 20 PIN HDR RT ANG	Headers & Wire Housings .100/.295 20 PIN HDR RT ANG	Headers & Wire Housings .100/.295 21 PIN HDR RT ANG