Arun Sirpal explains how to compare two plans in the Query Store:
A small but nice little feature I have been using recently can be found within Query Store.
Let’s say you have 2 Plan IDs for a query, naturally you want to view the execution plan for the different plans. In the past I did it a manual way, by that I mean by individually clicking on the Plan ID to see the plan then moving on to the next one.
It is much easier to explain with some images.
Click through to see those images.