Spent some time on this when looking to get into a 2018.
Most Ford parts websites have generic illustrations and list the grilles simply as 'style 1' for XL and XLT, 'style 2' for Limited, or 'style 3' for Platinum. The one you want is part number JL1Z-8200-PB. You will find these are just this side of $900.
According to my local parts department manager, the inner mounting structure, or backside of the grille assembly, is shared between the XL, XLT, and Limited, but the Platinum is different. Therefore, you cannot simply remove the painted/satin/chrome bars from an XL/XLT/Limited grille and replace them with the Platinums honeycomb material. Which is what I had hoped to be able to do.