Well, the rules for the Imperial Guard one are different than the one in the Sisters of Battle entry (different special rules and things), but the stat line for a Confessor is the same as the Captain, and when you charge, the Confessor and his squad can re-roll the failed to-hit rolls. They also can't join Ogryns or Ratlings. Up to 5 confessors/missionaries/preachers count as a single elites choice, which you may only make one choice of. Hope that helps... oh, and it is in US White Dwarf 274.
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