Difference between "ke neng" and "ye xu ba"? Is it "can" and "perhaps"?

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in my opinion,"ke neng" and "ye xu" have the same meaning--perhaps.it is a guess.
it is equal to "may "and "perhaps" in meaning, i think.

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"ke neng" or "ye xu ba" mean guess sth. 
if you are not sure about sth,you can say that. 
in my opioion,they are same meaning.

I add, in degree they are close meaning to "perhaps"~
or you can say 應該、大概~~to convey not certain

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"ke neng" or "ye xu ba" mean guess,presume sth. 
if you are not sure about sth,you can say that.
in my opioion,they are same meaning.