We generally haven't been updating creatures from 3e to 3.5 in the Creature Catalog, unless we were the ones to convert them to 3e in the first place (and by "we", I mean "the founding members of the Creature Catalog").
Besides which, 3e to 3.5 conversion is pretty easy, especially with a creature with low HD. Skills and feats are the primary change you'd have to make.