Comparing data from a Property Checkpoint

I'd like to compare data pulled from one web page and compare it to data from another web page.  Kind of a combination of Property Checkpoints and Compare properties.  What's the best way to do this?

What I'm looking to do is pull the contentText property on one page and make sure it matches on a different web page.

I"m sure the solution is staring me in the face, but can't seem to find it!