Question: Why does the Google Ads: Click conversion target show significantly more conversions than the primary conversion action imported from Google Analytics 4?

Answer: This discrepancy is due to the different attribution models. Google Ads: Click conversions target only consider paid touchpoints. If a user interacts with both 'google / cpc' and 'google / organic' before making a purchase, Google Ads: Click conversions target will attribute the entire transaction to 'google / cpc'. However, the Google Analytics 4 import does not follow this attribution behaviour.