Doesn’t Perfect Justice Require That the Penalty Be Paid By the Offender?

Questions about whether perfect justice requires that the penalty be paid by the offender rather than someone else, and whether the references in Scripture to sharing in the sufferings of Christ are only about persecution for one’s faith or include things like sickness and financial hardship.   For “perfect justice” to be accomplished, doesn’t the penalty have to actually be paid by the offender rather than someone else? Are the references in Scripture to ”sharing in the sufferings of Christ” only about persecution for one’s faith in Christ, or are they also about sickness, financial hardship, emotional pain, etc.?