Yes, it is somewhat school dependent.

But the schools all want to be amongst the best. So the quality is pretty high up. Haven't heard of anyone whose degree was questioned because they came from a "bad school". There will be at least some bar they will have to meet somewhere.

Though degrees from some schools are more appreciated than others.

Anyone can start a school, that is a right guaranteed by our constitution. It comes from a time where the Liberals were afraid of Catholics interfering in their education and vice versa so they limited the power the government has over education. And looking at what's happening in the world, it still seems relevant to me.

Being able to hand out recognized diploma's and receiving government subsidy is a bit more difficult, but also far from impossible and you can always send your students to the government organized exam center.

So if it’s not standardised, does that mean people pay more attention to where you went to school Vs the grade you got?

If you're going to university/college it doesn't really matter since you just enrol (or take an entrance test for a few majors). Of course, your chances of getting through will depend on the school you went to. If not, I suppose yes. But isn't that the same as everywhere else, or do you also have national exams for trades?