Is there a way to compare or overlay maps? I was looking to search for maps of Biblical times and compare them with maps of modern day.
Not yet, anyway. They're re-configuring their mapping technology ... that'd be a great idea to include.
Most people currently point to: https://www.logos.com/product/31905/rose-then-and-now-bible-map-atlas-with-biblical-background-and-culture
for some of what you need.