The smaller tiger in the below picture is Sumatran tiger. Larger tiger is Siberian(Amur) Tiger. While Sumatran tigers can weigh between 120-150 kg, Siberian tigers can weigh between 200-350 kg.
The picture was taken from this link. As there is no pure Bengal tiger lives in any zoo outside of India, that large tiger must be Siberian. Sumatran tigers are shorter in height and length. The Sumatran tiger in the picture appears to be matured, old male tiger.