Soundsike you're asking about the Business cars. The Business sedans shared the same senior chassis with the standard offerings but were intended for sale to the professional/livery trade and thus they had some of the luxury content removed in order to offer a lower priced vehicle and one more attuned to the commercial trade. For example there are differences in rear axle spacing and wheelhouse dimensions, seat widths, and in interior fabrics (plainer but more durable), etc., read the attached Business Sedan information.
External differences I've noticed in 1941 models (1942 probably similar or the same) are absence of the fender "whisker" trim and absence of a passenger side internal sun visor on Business Sedans. I've also seen at least one with a removable passenger side door pillar.
UPDATE: Nothing specific in my file about the 1942 Business cars but here's some Packard literature on the 1937 and 1940 Business cars. There are folks who visit here that know a lot more than I do about the 1941/42 Business cars and I'm sure they will offer more info.
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