02 Grand Prix ac issue?

I got a kit at advance with 4 random valves. The one that is supposed to fit mine has a different looking stem. It looks like the low side shrader valve and it doesn't have that rubber seal like my old high side port.

Anyways I was pulling a vacuum and it leaked down slowly after 5 mins after shutting pump off. I pulled high side gauge line off and that new port was hissing. I threw the old valve back in and it doesn't leak down after 5 mins.

So maybe the new valve is bad or wrong one?