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A) Assuming that both the EM are of same version, then you cannt migrate data and targets from one em to another.
B) Assuming that both the EM are of different versions like EM1 10.2.0.5 and EM2 188.8.131.52 then also you cannt migrate data and targets from one em to another. In this case you still have the option to undergo the EM Upgrade process which will automate the historical data and target migration. Read about EM upgrade : http://docs.oracle.com/cd/E24628_01/upgrade.121/e22625/toc.htm