While there is no official "build 738" listed in recent version histories, and Tubi 7.14.3000 (build 795) are documented versions. You should be cautious when searching for "modded" APKs, as Tubi is already a 100% free and legal service. Risks of Modded APKs
Downloading modified versions of Tubi from unofficial third-party sites carries significant risks: Download Tubi ver build 738 mod apk
: If you need a specific older version for compatibility, sites like APKMirror and Uptodown host original, unmodified APK files. While there is no official "build 738" listed