For the sake of entertainment and making commercial profit out of the serial the makers of Porus have changed the world history because you cannot compare Alexander the great with the king Porus.
Both were not born on the same day.
Alexander was only 29 yrs when he attacked India and Porus was the king with two teenaged sons at that time.
Alexander won the war and Porus was defeated.
So don't try to fool people.
