When a Sitemorse assessment is run, the number of issues / pages is a factor when calculating the score.

A full site audit can assess many more pages than a top pages audit, so there could be more pages with few or no issues, which can positively affect the score. Also, if an audit is run on a different date and time, there can be different issues found.

Full details on how a Sitemorse score is calculated can be found at: https://Sitemorse.com/benchmarks/