Not to my knowledge.
At VH, the AI receives 10.000 mnai per turn in addition to the EB-scripted bonuses that occur at all difficulty levels. Many people say that at VH it is also more rabid in its hatred of the player, but I've never noticed this. I know that, in M2:TW, relations between the A.I. and the human player automatically deteriorate over time unless positive interactions occur. This deterioration is quicker at higher difficulty levels. Since I always pay my neighbours a small but regular tribute, this probably prevents the deterioration in my campaigns, assuming the system is the same in R:TW. At VH, the rebels are also more likely to attack, but this occurs very rarely anyway. IIRC the A.I. will not recruit mercenaries at lower difficulty levels.
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