Apache - Same username in several .htpasswd files
Solution 1:
I'd suggest you have just the one .htpasswd file, and you control the users access via a AuthGroupFile, with the applicable: Require group xxxxxxx replacing your existing Require valid-user directives in the Location blocks, see:
http://httpd.apache.org/docs/2.2/mod/mod_authz_groupfile.html http://httpd.apache.org/docs/2.2/howto/auth.html