Mux/Demux vs Bus 2

I´m starting to learn about Xcos for simulation but I have some previous experience with Simulink. What is the difference between Mux/Demux vs. Bus/Debus and also, I could not find a Debus block in Xcos, is there a reason for this?

Scilab Not Spam 05-04-18, 7:17 a.m. Antonio