My experience:
Corresponding cycling zones are lower, swimming zones probably higher. Arhab already explained it by the degree of muscle movement.
Example AeT for me:
Mountaineering w/o poles 147 (just legs)
Mountaineering w/ poles 155 (legs and arms)
Running – 165 (whole body movement and core)
Rollerskiing – 170 (whole body)
What does your nose breathing say while cycling?
Best regards
Dada