Change group SamAccount name, implications

Hi,

We have an Active Directory 2008 R2 forest, with two domains. We found 66 duplicate universal security groups with the same SamAccountName. If we change the SamAccount name for the groups, what are the implications? As this groups are used for share permissions and applications, we are afraid that when we change the samccountname, the share/NTFS permissions will not update, the same is for applications that use the groups to authenticate users.

Can you please advice? It will be best if you cand send a link, as we will need proof when we present the solution to the client.

Thank you