Power pedals use the crank length to calculate power (it’s based partly on the cadence, the strain on the pedal spindle, and the crank length though there are probably other factors involved the precise calculation). They then transmit the calculated number to whatever device they are hooked up to, and that’s what TR uses.
So long as you set the crank length correctly through your head unit, then whatever device you attach to the Vectors will receive the correctly calculated power.