Rock'n nonne

I seem to be the only person who has noticed the remarkable similarity between "Sister Act" and "Brother Orchid", a 1940 Edward G. Robinson film. Does anyone else agree? Certainly the details of the plot have been changed to make the central character female and a singer. In the earlier play/film the Robinson character was a gangster who took refuge in a monastery when he was in trouble with the mob. He uses his business "talent" to put the institution on a better footing, as I remember, by selling flowers. The basic plot is that of the worldly individual entering a religious setting, at first attempting to con the inmates, and then becoming a real part of their system.