GlobalNav:
Had the crew decided or been advised by the dispatcher to fly the RNAV (GPS) Runway 18 procedure instead, they would have had the same approach path, VGSI note, FAF and approach fixes, same altitude restrictions, minima, visiblity and so forth.
Except they would have had a Baro VNAV path as part of the database approach; e.g., a perhaps much easier task for them than trying to meld FMS paths with a LOC procedure.
Anything dispatch did, or failed to do, is minor compared to this crew's (presumed with the RNAV 18) lack of judgment and competency for either IAP to Runway 18. Nonetheless, dispatch is "fair game" in the overall scheme of a Part 121 accident investigation.
A big part of such investigations is supposed to be to avoid a repeat.