Eigenvectors and values in R and SAS

Hi, 

I was wondering if function eigen() does something different from the
function call eigen() in SAS. 
I'm in the process of translating a SAS code into a R code and the values of
the eigenvectors and eigenvalues of a square matrix came out to be different
from the values in SAS. 
I would also appreciate it if someone can explain the difference in simple
terms. I'm pretty new to both programs. Thanks for your help-

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