I can say from experience that when I bought a support from Certifit, It had extra holes in it accommodate the differences.
also from a recent experience, doing a 3/4 nose on my neighbors truck. his is an 89 & I took the donor parts from a 98, both trucks were a/c equipped 5.7L models, because the LMC catalog said that they were the same parts. these were 2 oem supports & fenders that I was swapping out.
1: support had some j-clips in diff locations
2: the 7mm screw nuts were plastic one & metal on the other
3: the charcoal canister bracket mounts to the support differently. the 89 has welded nuts on the inside while the 98 doesn't, so I had to add nuts & washers to mount the 89 assembly to the 98 unit.
4: headlight harness clips across the front were mounted in a diff direction.
I didn't have any issues, just take your time & compare all of the clips
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