Didn't Stymie wear the little bowler-type hat? That's definitely Buckwheat in the pic.
Yes, your are correct. Here's more about that:
Stymie (Matthew Beard) - (1/1/25 - 1/8/81) - Stymie had a troubled adult life with crime and drugs. In later life he finally cleaned up his act, and made appearances on Sanford & Son. Both he and his father, Matthew Sr., a minister in Los Angeles, were born on New Year's Day. Stymie's trademark bowler was actually one of comedian Stan Laurel's hats which accounts for it's oversize. In 1981 he suffered a stroke, contracted pneumonia, and died at USC Medical Center. His last words were: "Fun, fun, fun...Had a lot of fun."