A product catalog includes information regarding products for sale online by various merchants. An analysis software module can collect information regarding new product offers and associate that information with existing product information in the catalog. The module can identify one or more potential product matches in the catalog based on identical or similar strong identifier information between the offer and the potential match, and/or based on query search result relationships between the offer and the potential match. The analysis module can evaluate each potential match by performing an image comparison between one or more product images provided with the offer and one or more representative images selected by the analysis module for the potential matching product. If the analysis module confirms a match, the analysis module can add information regarding the new product offer to the product catalog, associating the new product offer with the confirmed matching product.