Yes, you can run Performance Max (PMax) and Standard Shopping at the same time, but you’ll need to structure them carefully to avoid cannibalization.
1. PMax will take priority in most overlaps
If both campaigns are eligible for the same product and query, Google will typically serve the PMax ad first.
This can cause your Standard Shopping impressions to drop even if you keep both running.
2. How to prevent overlap
Separate by product groups: Assign only specific products to Standard Shopping and exclude those products from PMax via inventory filters or separate feeds.
Use campaign priorities: While priorities work within Shopping types, PMax ignores them, so you need product exclusions rather than just low priority.
Segment by geography or audience: Keep certain regions or customer lists exclusive to Standard Shopping.
3. When running both makes sense
If you want PMax for certain categories or high-ROI products, but still want manual control over bids, negatives, and search terms in Standard Shopping for others.
If you want to A/B test PMax vs Standard for different SKUs without crossover.
4. Watch your reporting
Monitor impression share and conversions for Standard Shopping; a sudden drop likely means PMax is taking most of the eligible auctions.
Use custom labels in your feed so you can quickly filter product performance by campaign type.