How can I compare the lengths of two objects in a picture?

I imagine there should be some sort of floating ruler hovering over each object and some cutting work to do to overlay one object on top of another while one object being transparent so that the length discrepancy is transparent.

Try using the Measure tool. It's in the same slot as the Eyedropper - keep pressing Shift+I until you see a Ruler icon. You can only have one ruler at a time, but if you open the Measurement Log  window (from the Window menu), you can record the current one, draw another ruler, record that, etc.

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