Cf: One good deed deserves another (Am.). One good turn deserves another (Am., Br.). Scratch my breech and I'll claw your elbow (Am.). /You/ roll my log, and I'll roll yours (Br.). You scratch my back, and I'll scratch yours (Am., Br.)
Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.