cvs script to check more than $Id values differ

When I import files into my own private CVS, then copy new files over my original files, I end up having to check files whose only difference is the $Id:$ line:

Index: chameleon/common.css
===================================================================
RCS file: /home/upacvs/website/themes/chameleon/common.css,v
retrieving revision 1.1.1.1
diff -r1.1.1.1 common.css
1c1
< /* $Id: common.css,v 1.1.1.1 2004/08/27 18:22:29 kitt Exp $ */
---
> /* $Id: common.css,v 1.7 2004/08/20 09:34:52 dries Exp $ */

A script that checks these are the only changes, then
discards the new file (and does a CVS up to get the old
current version), would be perfect for this case.