[R] replacing columns with same names

[eliza botto]

Dear useRs,
I have two matrices
> dput(EB)
structure(1:15, .Dim = c(3L, 5L), .Dimnames = list(NULL, c("A", "B", "C", "D", "E")))

> dput(EA)
structure(31:36, .Dim = c(3L, 2L), .Dimnames = list(NULL, c("D", "E")))
I have two question
1-Generally speaking, How can I replace the columns of matrix with the other columns having same names?
2-Precisely, how can I replace column "D" and "E" of "EB" with "D" and "E" of "EA"?
Thankyou very very much in advance.
Eliza 		 	   		  
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