If they are different then why the only thing that we 'see' in them, and that identifies them, the so called 'force' as we call and see it, is same among them all.
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This is an area of much research. Scientist are currently trying to combine all the four forces of nature into one force.
Actually, this has been done before. Before there were five forces- electric force, magnetic force, weak force, strong force, and gravity. However, scientists like Maxwell and Faraday came along and showed that electric and magnetic forces could be combined into one force, the electromagnetic force. Also, the electromagnetic force has been combined with the weak force, leading to the electroweak force (although there is still some debate, it is widely accepted by scientists that these two forces are really one).
The Grand Unified Theory tries to unite the electroweak force with the strong force while the Theory of Everything combines all forces into one. The idea is that at extremely high temperatures and energies, like at the beginning of the universe, all the forces were one, but as the the temperatures decreased, the forces seperated into the main four forces.
This is a field of ongoing research and I hope those wikipedia links are helpful.
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