The difference between LT3430EFE#PBF and LT3430EFE-1#PBF

hello all, we bought one batch LT3430EFE#PBF, but when we received the LT3430EFE#PBF, we found actually the part number is LT3430EFE-1#PBF on the label, any could tell me what is the difference between these two part numbers? could they be replaced by each other ? i could find any useful information in the related datasheet , normally it should be some part number rules which should define each letter or number's meaning of the part number. (  I see some other parts will have it in the data sheet with the item showing the ordering information )