Similar Covers

Above is the July 1939 issue of Black Book Detective, featuring The Black Bat. Below is the Fall 1941 issue of Exciting Western. See the similarities in the cover? Pulp cover artists probably made twenty-five dollars for a cover, so hiring models for each cover might not be feasible. Why not just a few changes in a previous painting? Thanks to Matt Moring of Altus Press for the heads up on these two covers. Both covers are from Ned Pines' Thrilling line.