True in many cases.
Considering that developers have been looking at dynamic resolutions if one game is 1080p30 the other may run at dynamic resolutions. Or run at a lower fixed resolution like 880p (which is 66% of the pixels of 1080p) or could letterbox some or a combination of such.
Once you throw in old tricks like lower resolution particle buffers, lower quality AA, reducing texture resolution and filtering, LOD, etc.
You're still depicting a strong vs weak machine .
Or you may see scenarios where Orbisd is 1080p and Durango has 720p with extra IQ.
That will be embarrassing .