UA client id -> GA4 user_pseudo_id

Hi I'm trying to do some validation while migrating to GA4. In UA, we used to have gaclient_id in the format of numbers (xxxxxxxx.xxxxxxxxx). Then I use user_pseudo_id in GA4 to link two data sources and managed to work for some instances. However, I met some cases in user_pseudo_id in GA4 in the format of having  random character first and the same number format at the end.(i.e. a1Y6CD0eHlHlpk0Q4zzLhya48pQAnIo1z8EfeNwjlaw=.xxxxxxxxx)

I wonder if there's any possibility that we can turn this random character string to the same format that we have in UA before so that we can link the data. Thanks!

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