I'm not sure if the effects are from scripting or the way AI plays having the same effect each time due to the same basic conditions, but there are several things that always seem to happen.

England: Takes York
Denmark: Takes Antwerp
HRE: Takes Hamburg, Metz and Prague
Milan: Takes Dijon and usually Bern
Poland: Bypasses Prague and Blitzes to that Castle that starts with the 'M'
And so on...