• Oldest Jain scripture (general): The canonical Āgamas (Āgams) are considered the earliest scriptures in Jainism. They were transmitted as Mahavira’s teachings and later codified by the Jain sangha; Ardhamagadhi Prakrit is the traditional language of these early texts. In short, the oldest group is the Agamas. You can read more here

• Oldest surviving text differences between Digambara and Śvetāmbara:

- Śvetāmbara tradition: Among the currently available Agamas, Ācāranga Sūtra is often regarded as the oldest in the Śvetāmbara canon, and the Vallabhi council (454 CE) formalized the 45 scriptures that Śvetāmbara Jains follow today. You can read more here - Digambara tradition: They do not accept the present Śvetāmbara Agamas as the original; their oldest surviving digambara text is the Shatkhandāgama (Scripture in Six Parts), traditionally dated to around the 2nd–3rd century CE, and it is highly revered as the foundation of their scripture. You can read more here

If you’d like, I can summarize the key points of Ācāranga Sūtra (oldest Śvetāmbara text) and Shatkhandāgama (oldest Digambara text) side by side.