Apple has released security updates to macOS Tahoe, bringing it to version 26.6.1, for Sequoia to 15.7.9, and for Sonoma to 14.8.9. mBoot firmware in Apple silicon Macs remains at version 18000.161.9, and the macOS build number for 26.6.1 is 25G76. I have now checked through bundled apps and /System/Library, and confirm that there are only small build increments across components involved with Screen Sharing, and no other build or version changes across the whole SSV.