What does the "Compare with" button in SERP overview allow you to do? Multiple answers may apply.

The "Compare with" button in Ahrefs' SERP overview allows you to analyze changes over time. You can compare SERP snapshots for the same keyword on different dates to track ranking fluctuations and new competitors. It also enables comparing SERP snapshots for two different keywords on different dates, which is useful for understanding how search results vary between related terms or how a specific keyword's SERP has evolved compared to another. The tool is designed for one-to-one or one-to-many comparisons of the same keyword over time, or a one-to-one comparison of different keywords. It does not support comparing six or four different keywords simultaneously; the limit is two distinct keywords for comparison.