despite what clrmame says, the problem seems to be in your romset (your changes are correct).
let's do an experiment: try to create a new rom folder (changing mame.ini accordingly) and to put into that a single puckman zipfile containing both the pacman.zip and puckman.zip files from official MAME (create this romset by hand, not with clrmame). then try to lauch it again: it should work...
if it works in this way, then your problem is some parent/clone or split/merging option in clrmame...
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