Helen Kane and Mae Questel 1935

Are Helen Kane and Mae Questel, the Boop-a-Doop girls, one and the same?

They are not, Helen Kane first played in the Four Marx Brothers revue after which she appeared in vaudeville acts and night clubs and was given an opportunity to appear at the Paramount Theatre in New York, where she won instant recognition with her "Boop-Boop-a-Doop." She has made several pictures for Paramount.  

Mae Questel is the voice of Betty Boop, and also the voice of Olive Oyl in Popeye the Sailor.