I suggested that we named the hitch based on a fig-8 (pretzel) the Bull's-eye hitch and as you suggested the one base on the overhand knot the Bull overhand hitch.
So we have the Bull overhand bitch and the Bull's-eye hitch a perfect matchup.
And I can not even see how one would be able to perform such an experiment
I use a pull-buoy made of compresible material to observe to a certain degre the amount of force an hitch can give. I once placed a cat's paws binder on this contraption for a whole week to verify its gripping power.
On the pictures shown the binder is in direct contact with the pull-buoy which I dont permit in a real experimentation it is always a good idea to protect the material, there is plenty ways to preserve the surface but it's not the place to discuss that.
edit 1= with a ruler one can observe (in the case of comparing binders) the lenght of the rope being grabbed; a shorter lenght will show a stronger binder
Picture 1 = the Pull-buoy with the Bull overhand hitch in place
Picture 2 = The Bull overhand hitch at work