Full Answer
While perfect alignment is impossible, you can reduce variance between platforms from 50%+ to 10-30% through server-side tracking, matched attribution windows, and proper deduplication. The goal isn't identical numbers—it's understanding what each platform tells you. How to Narrow the Gap 1. Use Server-Side Tracking for Both Facebook CAPI for Facebook conversions:
- Server sends purchase events directly to Facebook
- Bypasses ad blockers completely
- Includes user identifiers (email hash, phone hash)
- Receives full attribution credit regardless of browser blocking GA4 server-side (GTM server or WordPress plugin):
- GA4 receives data from your server, not browser
- Ad blockers can't interfere
- Both platforms see identical conversion events
- Reduces data visibility discrepancy from 30-40% to minimal WordPress-native advantage: WordPress plugins that implement both Facebook CAPI and GA4 server-side send identical data to both platforms:
- Same timestamp
- Same user identifiers (where available)
- Same transaction value -...
