Contact system and wire range
The 166500-9 is a tin-plated signal socket contact from the AMPMODU series, accepting 22-26 AWG wire with a crimp termination. Rated 3 A per circuit, the tin finish suits moderate-cycle applications where the mating count stays below the fretting threshold of gold.
Sourcing and second-source check
The 1-448140-2 is a different connector type (power, ARINC 600 series, gold-plated pin, solder termination) and does not drop into the same housing or wire range — not a functional second source.