pixel counting is incredibly difficult as you have to find aliased lines of a specific length to perform it. I'm not sure what the chances are of finding aliased frames at those specific moments. Reconstruction ala Temporal upsampling make this much harder unfortunately. If it was a simple upsample I think resolution counting would be straight forward and automated. But the move towards temporal makes this incredibly challenging and thus we have no automated counters today.When a framerate drops on both systems it'd be interesting to capture the resolutions over the course of that single second. In order to see total pixels rendered.
But really it might be overkill especially when both consoles are performing remarkably similar.