From UO Guide
Paroxy Swampy -
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Summons a dark green swamp dragon that bonds to you upon summoning. Comes with unbreakable swamp dragon armour and GM wrestling, tactics, and resist.
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Swampy Barding -
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A Dragon Barding Deed is a deeded item that is crafted by blacksmiths and used on tame, unarmored Swamp Dragons.
The armor will provide the rider of the dragon with extra protection in combat. This is done by absorbing a percentage of all damage received. Exceptional dragon barding allows a Swamp Dragon to absorb 20% of the damage inflicted upon the rider, while non-exemption barding provides only a 10% reduction. The damage reduction only works against monsters, not in PvP combat.
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Thats all that I could find.
It doesn't state that the paroxy's is exceptional.
I do remember someone testing it and showing that the paroxy's was equal to the non exceptional.