Swapping out rear sheetmetal 1974 Swinger to 72

The older I get, the less of a purist I am. Never was that pure anyway.
Slap me sill, but I have wanted a 70-2 Swinger (love the lighted back bumper! why? dunno!) project but like most Mopar projects in Tx. overpriced junk. But the 73 (or is it 74?) Swingers with the BIG back bumper etc can sometimes be finagled loose for way less IF you find a guy that finally realizes such is not a hemi Cuda. (Like buying a 70-2 Duster project vs beakers.)

My question is, is trunk lid the same? the quarter end caps? early Swingers have a rear valance no doubt. What do I need to do to change over these models? Or am I confused in my old age...again!? I can get the parts cheap enough to change over from old boneyard if feasible.