Depending on the model year of your Sahara, there may be a difference (but if you are installing a whole different grille it won't matter).
2016 and newer Saharas, the Recon, and many other older "special editions" (like the Polar Edition, Dragon Edition, Altitude Edition etc.) have a dual grille that has unique inserts in the slots and around the headlight openings. Rubicons, Sports and 2015 and older Saharas have the base grille.
^^ dual grille from a '16 and newer Sahara
^^ base grille
The dual grille with the inserts has different shaped slots than the base grille. If you are buying a replacement factory grille, you can use either type as they are interchangeable, and you may be able to find a color-matched take-off on eBay, craigslist or from retailers that sell take-offs.