Does it sync products with the same SKU?
SKU Stock Sync syncs variants that share the same SKU at the same Shopify location.
It does not sync products just because the products have similar names, collections, tags, or options. What matters is the variant's SKU and Shopify location.
If two variants use the same SKU at the same location, SKU Stock Sync may treat them as part of the same SKU/location group.
If the same SKU exists at a different Shopify location, that location is treated separately.