Diego,
The devices should work fine together, however the 4.1.1c devices won't have the ability to use the SSL (HTTPS) AO or any of the other bug fixes that are in 4.1.3b. It is also important that the CM is upgraded to the newest version that is on the network, so it should also be upgraded to 4.1.3b if you have that version on the network.
I would recommend that they attempt to stay at the same code version Enterprise-wide, and I would definitely recommend the 4.1.3b version over the 4.1.1c if they have a choice.
Hope that helps,
Dan