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Don’t overthink “primary keyword cannibalization” on product pages. If you sell two very similar items (like M1 vs M2 breast pumps), it’s fine if they both target “portable breast pump.” Google understands these are unique products, and people search by model names too.
If one is electric and another is manual, then sure “portable electric breast pump” vs. “portable manual breast pump” works. But don’t force a variation if it doesn’t feel natural.
