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gbj_tester
danb
What are the values you are getting?
The 170mm arm should read slightly higher, due to the increased torque.
Bear in mind however that neither is 100% accurate. Most power meters are +/- 2% , so you could have one with -2% accuracy and one with +2 % accuracy.
Also the stages is only measuring power from one leg - a discrepancy of a couple of percent between legs is also common, sometimes considerably more and typically not consistent - it can very between legs at different power levels and fatigue.