Proportioning Valve Outlet Fitting

[Father&son56project]

A possibly dumb question here, but here it goes: I’m putting in a disc/disc brake system and I need to know which fitting to use at the outlet (to the rear brakes) of the PV4 universal GM style proportioning valve. I plan to run 3/16 line out to the rear. The product info from MBM Brakes for the valve tells me that the outlet is a 9/16-18 fitting, but says nothing about line size. I can order a “9/16-18 Inverted Flare Nut; Line Size: 3/16" like this from Rockauto:

https://www.rockauto.com/en/moreinfo...1000606&jsn=67

Or I can get the “Proportioning Valve Adapter Fitting Kit - Set of 3” from CPP like this:

https://classicperform.com/cp2091

Are the fittings from both places in fact the exact same thing (other than getting 2 unneeded ones in the kit)? Sorry if this sounds dumb, but all my searching has turned up conflicting info and I have zero knowledge where fittings are concerned. Any input would be greatly appreciated.