Yes, Akitas are taller and much heavier than German shepherds, which you may not be able to notice until they’re side by side.
Male Akitas weigh between 84-128lbs whilst measuring 26 inches -28 inches tall, whereas a male and female German shepherd weighs around 75-97lbs, and a male measures 22-24 inches tall.
Female Akitas are smaller than male German shepherd dogs though.