How to join 2 views block with a views page
If I understand your question correctly, you want to display the result of a View into another View. You can do this by using the contributed module Views Field View:


  views_field_view allows you to embed one view into another view and pass arguments along


By using this module you can add an extra field to your View1 and View2, which shows the result of your View3.

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In your updated question, Views3 has become a separate block. Using a contextual filter you can limit the rows to be only from a specific node (id), the one that is being displayed. The answer on How to associate the current Node ID when running from Block layout? should point you in the right direction, your contextual filter should be similar to the one you used in View1.