Sorry, I’m not sure what you mean by “the 4th ara” and “the 5th” in Jainism. Could you share the exact context or text you’re referring to (e.g., which scripture or tradition, Digambaras or Śvetāmbaras, and whether you mean a temporal era, a specific ritual, or a stanza in a hymn)? Once I know the precise reference, I can explain what changed from the 4th to the 5th with authentic Jain meanings.