All CBs created equal?

[unmerged(7597)]

Obviously, CBs have an effect on the AI - AI countries can be guided in their actions by shields, for example. But does anyone know if different types of CB have more or less effect on the AI? For instance, does a CB shield tend to produce more AI behaviour than a permanent CB in the scenario file?

 

[Havard]

My guess would be that a province CB is more likely to trigger a war. I have no hard facts to back this with though...