Can vorher be replaced with vorhin?
Wir machen nicht, wie vorhin angesagt...
Can we replace here vorher? What is the difference between the two words?
"Vorher" (and, equivalently, "davor") means "before" or "earlier", so it's relative to some point in time that should be clear from the context. "Vorhin" means "a short time ago", so it's relative to now.