You can publicize to 2 different Facebook Pages, but you will need to create 2 different Publicize connections on your site, with 2 different Facebook users.
Once you have created the first connection, go to Facebook, log out of your account, and log back in with another Facebook account, that is listed as a manager for the second Facebook Page.
Once you have done so, go back to Settings > Sharing in your dashboard, and create that second Publicize connection.
I hope this helps.