Hi Paco;
Yes, the architecture of the PB 2017 Universal edition's Mobile server (PowerServer) will not be exactly the same internally as the current Appeon Server for Appeon Web/Mobile. Thus, if you are planning to run both products, you will need to run two instances of the server - one for Web & the other for Mobile.
In the longer term, Appeon is planning to bring the two slightly different server architectures back together so that you can run one PowerServer for both.
An unlimited concurrent user license for PowerServer is included with PB 2017 Universal for production use.
HTH
Regards .. Chris