Hi, Chanbec,
Welcome to the forum!
I think Movelia is a reliable site. I have used it frequently to check out schedules and find the names of some of the tiny bus companies across Spain. It must be some kind of third party vendor. But I have never bought a ticket through them.
I had never heard of Linecar, but I learned that is the new name of a line that I am more familiar with, which used to be AUPSA. This change took place earlier this year according to
local news. Looks like the Salamanca to Bejar line has various departures, but the faster trips are likely the ones designated with a (1) (stop only in Guijuelo and another place).
I’ve attached a screen shot.
As far as Zamora to Salamanca, yes, you are right there are lots of buses. I’ve attached a screen shot of the schedules.
Zamora and Salamanca are two beautiful small Spanish cities. Are you continuing a walk that ended in Fuenterroble? I’m just curious how you came up with those five days to walk.
Buen camino, Laurie