Ford 94 equalizer valve

[Oldog3]

I am rebuilding 94's and the kit came with 2 ECONOMISER valves . I am trying to figure which one to use , on the left is the equalizer valve that came out of the carb I am rebuilding and the TOP looks the same as the one on the far right however the BOTTOM looks the same as the middle one

The middle one is the same depth as the one I took out .

Everything is telling me the middle one is correct but as this is my first rebuild try , my confidence is telling me to ask why this is correct as I have 3 more to do

Thanks
Dan