Always been a big difference in grille between the models....my 41 is butterfly design everywhere...the grille, hood and front gravel sheild, front bumper is butterfly...the 42 Plymouth you show is distinctly different than the 41 grille ..appears to have the center divider carry over from the 41 and the grille is same size bars compared to the post war which are alternating sizes...
DeSoto is just so massive in the grille...BOLD...Chrysler is well, just Chrysler...no offense to you Chrysler owners. I think you see less of these so it is just not something one is very familar with.