New information has surfaced, indicating that Google is working on an entirely new phone that will be called the Pixel 4A 5G, with codename "Bramble". This, of course, opens up the possibility of the Pixel 4A 5G and Pixel 5G both using the same SoC.
https://www.notebookcheck.net/The-Google-Pixel-4A-5G-and-Pixel-5-may-sport-the-same-SoC-Pixel-5-XL-release-in-doubt.480969.0.html