Harness compatibility help

Let me add that the diagrams are useful but you will probably be best off by laying out both harnesses on a bench.
Label the connections and then compare.
Examples.
https://www.forabodiesonly.com/mopar/threads/wiring-nightmare.400301/#post-1971967877
Note that my statement in that thread about Packard 56 connectors is not entirely correct.
Most, but not all, of the connectors are similar to a Packard 58.

Basic harness strategy was to bundle the wires for secure attachment with just enough stress relief. Pay attention to how the harnesses are routed and supported.
The wiring strategy is helpful to understand why certain items connect to the loactions they do.