Random project chooser for laravel

today I have two similar Laravel projects, they are exactly the same except for the Laravel version, the first is running on 5.5, and the second is the updated version running on Laravel 9. The Laravel 9 one is not in production because we need a way to test it and check if everything is working after the update. My question is if there's a way to redirect to some clients only the newer version. The projects for the clients are exactly the same.

In conclusion I need a way to show to like 20% of the clients the newer version, and the older version for the other 80%, is possible to do this? Is there a better way to test the newer project for errors?

Thanks in advance.

via Chebli Mohamed