Yes, It's Possible:
A Meta Pixel is tied to a Business Manager, not a specific ad account.
You can share the pixel with multiple ad accounts under the same Business Manager.
This allows the new ad account to access past data collected by the pixel (like ViewContent, AddToCart, Purchases, etc.).
But Here’s What Matters for Efficiency:
Pixel Must Be Properly Shared:
Go to Business Settings → Data Sources → Pixels
Select your pixel and assign it to the new ad account
Also give your new ad account “Manage Pixel” permissions
Historical Data is Used Only for Optimization:
Meta uses pixel data to train the algorithm, especially for Conversion and Sales campaigns.
So switching accounts won’t affect learning from past traffic if pixel remains the same.
Custom Audiences Are Account-Specific:
New Account Has Fresh Ad History:
While pixel history helps, the ad account itself starts fresh, meaning lower trust/credibility.
Expect slightly higher CPMs and slower initial optimization unless warmed up properly.
Pro Tip:
If your old ad account has issues (disabled, flagged), this is a good workaround. But if you're just testing, consider using separate ad accounts for different regions or product lines, but keep using the same pixel for better consolidated tracking.