The biggest differences between a guinea fowl and a turkey include their size and egg size.
The average guinea fowl weighs up to 3.5 pounds, stand 1.9 feet tall, and grows 30 inches long with eggs that are about 2 inches in length, with a production rate between 80 and 160 eggs a year at the utmost. Turkeys weigh up to 30 pounds, measure 3.5 feet tall, and measure up to 46 inches in length while having eggs over 3.5 inches long while producing about 100 each year.