No, although both are abnormal growths in the uterus and can sometimes appear very similar on hysteroscopy.
A submucosal myoma is a tumor formed by muscle tissue growing from the myometrium into the uterine cavity. Unlike most polyps, its superficial vascularization is striking.
However, fibroglandular polyps are highly vascularized and are of greater consistency, which can be mistaken for fibroglandular myomas.