Source: https://next.amboss.com/us/article/c30ahf#Y1497c54f6d6c92a20f25854534d0bf25
AMBOSS: "Hemorrhoids are not varicose veins (dilated, tortuous veins). Anorectal varices occur, e.g., as a result of portal hypertension. The terms anorectal varices and hemorrhoids are often used interchangeably, but this is incorrect."
Another [primary] source describes the difference as this: "Rectal varices may be confused with internal hemorrhoids because of their location. However, hemorrhoids are not related to portal hypertension. Hemorrhoids result from a displacement of the anal cushions and hyperperfusion of the arteriovenous plexus vascular cushions without direct communication with any of the major branches of the portal venous system." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3342598/