The Jeep nomenclature can get confusing. Looking at your dash is an easy way to tell!
WHICH 2018 WRANGLER DO I HAVE?
2014 - 2018 WRANGLER "JK" FACTORY FRONT DASH SPEAKER GRILLE
This era of Wrangler featured a "round" grille on the front dash. Wranglers that were equipped with the Alpine system from the factory will have an "Alpine" badge added to them in the center of the circle.
2018 + WRANGLER "JL" FACTORY FRONT DASH SPEAKER GRILLE
Current 2018 + Wranglers have what come would call a "rectangle" speaker grille on the front dash. There are no added Alpine markings on the Alpine factory system for this era of grilles. The easiest way to tell Alpine versus non-Alpine is the added subwoofer in the rear cargo area.