pre 72 and post 73 K members are diff monsters.

Aside that, 70/72 are a bit diff from pre 69. Interchanges as a full assembly but sway bar mounts diff, so if you install a 69 K member on a 70, will need to match the 69 sway bar parts as far I know

Then, up to 72 all V8s are same K member but Hemis... and of course /6s are diff from the rest too.

since 73, /6, SB and BB are diff.