grammar - The difference between "given that" and "provided that" (CAE book reference)

I don't understand the difference between "given that" and "provided that".

The tour wasn't as pleasant as we thought it would be, given that the
coach broke down on the way.

[Source: CAE Book]

1. Why can't I use provided that in place of given that in the above sentence?





2. What's the difference between given that and provided that?