Claim: Kashtan (Russian: "Каштан" which means "chestnut") is heavier compared to Kashtan-M, weighing 15,500 kg versus 12,500 kg.
Evidence: Weight 15,500 kg (34,200 lb) 12,500 kg (27,560 lb) In Russian, the word "Kashtan" (Каштан) means "chestnut".