IF INDEED - You have isolation, of each circuit(s) in this question = via correctly configured close spaced tee's
then you have isolation and pumping of the isolated zone will/should have no effect on its mate - because that zone is "isolated" via connection
or some such B/S
Maybe Ill have to get back to you on that - The second always correct answer
Isolation is good, no ghost flow into the secondaries ever.
Reason I ask is two fold:
1) Secondary circulator, on reflection, appears to be a tad small, and
2) What's the web address for that avatar pic?