Top waits, Top SQL, etc. are all different dimensions that you can use to understand what's contributing to database load. Dimensions are not comparable with each other.
It sounds like you want to diagnose what's contributing to the PostgreSQL "CPU" wait event. You can find more information on this topic in the official RDS docs on Tuning with wait event .
If the issue turns out to be suboptimal queries, then you can find the worst performers in the Top SQL tab (dimension) of Performance Insights.
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