I cannot say for sure for official T → community U on the same version …
Least for me (Pixel 4a community T version 2.6.4 → community U version 2.7) and others the adb-sideload approach worked well:
That approach seems to be somewhat “reliable” for many models (browse the forum for “dirty upgrade”) … but: No guarantees (!) and not sure if there´s anything special to be considered in your case beforehand - besides backups of important data and settings.
I am sure others will jump in with insights as well …
Of course You´d need to adopt the correct file: redfin/e-2.7-u-20250111460593-community-redfin.zip