Maybe GM changed to or selected another vendor for the fuel filter. They did the same thing a while ago with the oil filter, it was #55577033 and now its #19301505. Even though they both look like the WIX #WL10021 filter.
You can try calling gmpartsdirect for clarification or even check with Rockauto.com and or quirkparts.com. Hopefully they'll tell you the same info.
You can try calling gmpartsdirect for clarification or even check with Rockauto.com and or quirkparts.com. Hopefully they'll tell you the same info.