Digital BW, The Print

Thank you Tony, Lincoln and others. What is getting lost is my original question: "The question I have is how do I best evaluate - on screen -
scans of the same frame made at two different resolutions?" Before you say to view at actual pixels, I know that part of the answer. But I think it's more complicated than that. Viewing a 6 foot length of tree branch at actual pixels from 2 differently sized scans makes that same length of branch different lengths, in inches, on the screen. This makes it hard to look at the same section and make a direct comparison. It the lower rez scan is magnified beyond actual pixels then interpolation(?) from software becomes an issue. But without a same sized, side by side comparison of the two scans, how do I best evaluate them?