When an offending player’s call is withdrawn and it is replaced by a comparable call (see Law 23A), then if he becomes a defender there are no lead restrictions for his side. Law 16C does not apply, but see Law 23C.
When an offending player’s call is withdrawn and it is not replaced by a comparable call, then if he becomes a defender declarer may, at the offender’s partner’s first turn to lead (which may be the opening lead) prohibit offender’s partner from leading any (one) suit which has not been specified in the legal auction by the offender. Such prohibition continues for as long as the offender’s partner retains the lead.