Under certain terms, probably yes, I would say. But it is hard to determine if it would. So yes and no really. . .
A Siberian Tiger is the largest from the cat family. So the Bengal Tiger is not larger.
Yes. Both cats are tigers, and all tigers are related.
The largest male Siberian tigers are larger than their Bengal counterparts, but not much larger. However, two studies since 2005 seem to show that Bengals are larger on average.
A Siberian tiger is stronger because they are bigger and they eat better and more better prey then Bengal tigers.