Google Ads says one conversion number, analytics says another

This one never fully goes away no matter how long you do this job. Attribution windows are different, tracking setups drift out of sync, someone changes a goal definition in Analytics and doesn't tell anyone, and now the two platforms disagree on a number that's going straight into a client report. Figuring out which one is right, or whether they're both technically right but measuring different things, used to take longer than actually building the report itself.

What's helped is having a model like hypd.ai pull both sets of numbers side by side and flag the specific line items where the gap is largest, rather than me eyeballing two dashboards and trying to spot the mismatch. It points at exactly where to start looking instead of a general sense that something is off somewhere.

Curious how other people handle this once they're past a handful of accounts?