Do I need to re-calibrate my transducer if I changed conditioners of identical model numbers?
It does not matter if it’s the same model number or not. There is variability from one conditioner to another.
Swapping conditioners will have some effect on the calibration of the transducer it is connected to.
The effect could be small (or not) but the only way to document, maintain measurement trace-ability, and determine the impact, is to re-calibrate.