How can I apply changes to user permissions across several sites? I am using Drupal 7, we have a total of 99 different instances of pretty much the same site.  All sites have the user roles of adm_core and mgr_center.  

We are currently using drush and puppet to apply changes/updates across sites.  

What I'm wondering is if there is a drush command that I can use to just give adm_core the same privileges as mgr_center?

If not does anyone have suggestions on the best method to do this across all sites short of going and changing permissions site-by-site?
I found this snippet for copying permissions from one role to another, which you can easily rewrite to a drush sql command and integrate in your current workflow.