Summary
GA4 and Google Ads use different conversion modeling. If Google Ads shows more conversions than GA4, modeled conversions might be the reason. GA4 exports only observed conversions to Ads, which then applies its own modeling. This can increase the total conversions in Ads, causing discrepancies with GA4. There's no option to disable modeled conversions in GA4, which can cause differences between GA4 and Google Ads data.