My truck came with 2 in the vacuum system from factory (AFAIK), these were the first things I checked. The one closest to the intake manifold held no vacuum so I went down to dodge and they ordered me in one. This newer one doesn't hold any vacuum, it just feels like a restriction from one side. The other check valve that is right before where the line goes through the firewall holds vacuum just fine.

To answer your question, my guess is that they are not the exact check valve in that TSB, but there is the 2 factory ones already in there.