The S18 is a specialty wedge, meaning it doesn't belong to a single set, it's more like you have every loft available, go for a fitting, find out your yardage gapping and go for the loft that fits that gap. It's the Silouette Shape wedge, arguably a bit more "MP" orientated as the other two.
The 919 Forged Wedge should give you similair looks and feels to your 919F Iron Set, the gapping should be constant, as I am sure they have robot tested the lofts to give you good gappings and it is forged.
The JPX Wedge arguably sits more in line with the 919 HM Range, isn't forged but cast, but might also be an alternative, depending on what you are looking for. Looks and feel should in term be different from your iron set, but it may be what you are after. I would recommend you go and hit all 3, or at least look at all 3, and go with the one that makes you want to hit it the most.
Hope everything was correct here.