There is no significant difference between listing results which are labeled as Fixed Price or Store formats. Both types of listing results are considered Fixed Price format listings on the eBay marketplace currently.
If you are researching Fixed Price listings, it is recommended that you check both the Fixed Price and Store checkboxes in the Listing Format filter.
Terapeak does not alter listing data received from the marketplace and currently four values are possible for the format of eBay listings, determining whether listings are marked as Auction, Second Chance, Fixed Price or Store.
Store results are not an indication of shopper traffic originating from eBay Store pages.