According to the wiring diagrams I have, the 71 and 75 Pinto turn signal switch wire colors should be near identical, not sure about the plugs. Both years show a total of 9 wires. After 40 years, the wire colors tend fade and/or shift color some.
W-LB: RH dash turn indicator
W-LB: RH front turn light
LG-W: LH dash turn indicator
LG-W: LH front turn light
LG-O: LH rear turn/stop light, (early 71's used LB-O, this is only difference found between early 71 and late 71 & 75)
O-LB: RH rear turn/stop light
LG: brake pedal switch
W-R: emergency flasher
LB: turn signal flasher