Pinterest says 41 conversions, GA4 says 9, Shopify says 14. Which one do I believe?

Small conversion campaign, about $600 spent this month. The three dashboards are so far apart I can't make a call on whether to keep spending. I understand attribution windows differ but a 4.5x gap feels like more than window differences. Is there a sane way to reconcile this or does everyone just pick one number and stick with it?