The difference between GA1.2 and GA1.1 isn’t related to GA4 and UA, but reflects the structure of the _ga cookie used by Google Analytics in general. Generally, GA1.2 or GA1.1 refers to the domain depth, not the version of Google Analytics. This essentially means the number of domains under the main domain where the cookie is active. But if you’re experiencing discrepancies with user tracking, it might be more related to how your GA4 and UA tags are set up rather than the cookies themselves. Make sure that both are tracking the same information correctly. In theory, both the GA4 and UA tags should be generating the same version of the _ga cookie, therefore the differential shouldn’t be a big issue in your analytics tracking. If the problem persists, it’s recommended to consult with a Google Analytics expert or reach out to the Google support team.