Okay, comparison #3 started about 20 minutes ago concurrently mining ZEC on Flypool using a fixed difficulty of 10000 (by using the switch "-p 10000").
If you like watching paint dry then you will surely love to check on the status of the miners:
I created these two addresses just for this test so they are starting from 0.
Just a thought... What if one card performs better than the other? (Silicon lottery). Will you interchange miners for those cards on your next experiment?