Kegging question

[quiet_dissent]

I recently purchased two new Kegco ball lock kegs. I have a question regarding the little posts/springs inside the ball lock mechanism on the keg:

Are the posts and springs fitted for In and Out? That is, is there a significant difference between the posts and springs for each? I know about the notch and such but was wondering about the innards (beyond the dip tube). Could placing the wrong post/spring combination together after cleaning and sanitizing lead to issues with carbonation, etc?

Thanks in advance!

 

[BigFloyd]

The guts inside the post (poppet, spring, etc.) should be the same for each.

The posts themselves are specific to CO2 in and liquid out.