HG next to the valve stem is correct for standard 14x6 steel wheels.
Unless your trunk pan has been replaced, your car came with a space saver spare due to the location of the tie-down for the hook.
I would say someone threw in a standard wheel-spare in your car at some point.
The four wheels for the car would have been black. I have never seen a TX wheel. No idea what that is from.
I guess it is possible that the TX (grey) wheel was a spare, but I doubt its from your car as your car should have a space saver. Do you have the PHS on your car to confirm? Might be another unusual factory oddity.
What sticker is on the underside of your trunk lid? does it show full size, or space saver?
Oh, and you definitely have the correct jack. Hold on to that as they are impossible to find. The jack handle should be slid in between the rubber sleeve and the shaft, not inside the shaft like you have it now. The sleeve is there to hold them together and keep them from rattling.
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold