Cross training : rowing to cycling HR comparison

Hi all, please link me to a related thread if it exists but couldn’t find one fitting on my own.
Question: what is the relationship btw heart rate (HR) training zones for cycling and rowing?

I am crosstraining with rowing at the moment. I have a HR monitor and the concept2 has pace (time/500m) and wattage. My endurance HR for cycling is around 130-150bpm so I decided to start at a pace that would put me at 140bpm. My cycling wattage for this 140bpm is around 200w however my rowing wattage was about 125w (2:20/500m).
This got me thinking is the HR zone more like running (high HR for any given RPE relative to cycling).it might be the case that I am an inefficient rowing atm and these watts will converge with experience (rowing watts → cycling watts).
Does anyone know some science or data? Anyone have personal experience?

I’ve been a rower off and on since '08/09. In the last month I restarted after a year long break; similar experience. RPE for a given level of watts is much higher when rowing than when cycling.

The concept2 forum has an old thread with more anecdotes and links to some studies https://www.c2forum.com/viewtopic.php?t=11299

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