very concise answer. thanks!Yes, they use the same numbering system. Most cheap economy oil and air filters will use one of three numbering systems: Fram, Wix, or Purolator's numbering system. However, this DOES NOT mean the filter is made by the same company they copy the part number from. For example, that STP isn't made by Fram.
So yes, your STP S7317 fits the same cars a Fram PH7317 fits
Also, consolidation is common with cheap jobber filters. For example, the 7317 is often consolidated with the tiny 6607