Measure angled length in Elements 12

Hi. I have several images each with randomly laid out blocks.  The images are different scales and I want to rescale them so that all the blocks are the same screen dimensions.  What's the best way to do this?

I was hoping that there would be some Point A to Point B measuring tool where I can click two corners of a block, and then compare the same length on the other images, and then scale one of them so they are both the same screen size.

Is there such a tool, or some other way?  I really don't want to lay one on top of the other and try to rotate and manually scale the top image to the same size as the bottom layer!

Thanks