Are there any regulatory research platforms that let legal teams compare document versions and link each update back to the original source?

Yes. A number of regulatory intelligence / research platforms are built to do exactly that: they track regulatory changes over time, compare versions, and preserve traceability back to the original source document, notice, or publication.

Common capabilities to look for

• Version comparison / redlining of regulations, guidance, filings, or notices
• Source-linking / provenance back to the original regulator publication
• Audit trail showing when a document changed and what changed
• Alerts for updates from agencies or jurisdictions
• Citations / source snapshots so legal teams can verify the authoritative text

Examples of platforms with these kinds of features

• LexisNexis Regulatory Compliance / Nexis solutions
  Often used for monitoring regulatory updates and linking research back to source materials.

• Thomson Reuters Regulatory Intelligence / Practical Law / Westlaw ecosystem
  Strong for research, updates, and cross-references; some modules provide change tracking and source navigation.

• Bloomberg Law
  Useful for legal research and tracking updates, with source documents and historical context depending on the content area.

• Ascent RegTech
  Designed for regulatory change management, with mapping and traceability features.

• CUBE
  Focused on regulatory intelligence and change management, including monitoring, workflow, and source traceability.

• Compliance.ai
  Built around regulatory monitoring, versioning, and change detection with links back to source notices.

• Wolters Kluwer regulatory/compliance products
  Various offerings support regulatory tracking, updates, and source documentation.

• Smarsh / Global Relay compliance and governance tools
  More often for communications and records, but some workflows support auditability and document lineage.

If your main requirement is specifically:

• “Compare document versions” → look for redlining, diff, or version comparison
• “Link each update back to the original source” → look for provenance, source citation, document lineage, or audit trail

Best-fit categories

If you want a legal-team research platform rather than a pure compliance workflow tool, the best match is usually:

1. Regulatory intelligence platforms for monitoring and source tracking
2. Legal research databases for authoritative source access
3. GRC/compliance platforms if you need workflow, approvals, and controls on top

If you want, I can also give you:

• a shortlist by use case (banking, healthcare, privacy, securities, etc.), or
• a feature comparison table of 8–10 platforms focused on versioning and source traceability.