Here’s the full manual for the XBee SX RF modules.
See page 21-24 for the pin map. It looks like if you ignore pin 1 and start with pin 2 on the SX as pin 1 on the standard/popular xbee pinout (like on the arduSimple boards), then VCC, Rx, tx, and pin 11->10 gnd should line up. Even pin 5 reset & pin 6 rssi output should match.
So I’m thinking it should work to solder a 2mm pin header to the SX and plug it into any standard XBee socket.