Test Execute funcionality and licensing

Hi everyone, I would need to understand if Test Execute replaces Cross Browser Testing and Bitbar functionality. 
I can't see the difference between licensing one or the other of these solutions. 
In the same way, I´m going to license TestCompete Pro (perpetual) and Test Execute is included in the offer, but I don´t know if its license will be annual or perpetual too.
I wrote to sales email adress in order to get more info about my questions, but still no answering me.
Thank you very much in advance. 
Regards