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Changing ContentTypeId in URL for DispForm.aspx not changing the form

I am trying to change the form on a button click by forming URL and adding ContentTypeId to it.
It works perfectly fine when the form mode is New or Edit, but when I try to do same for DispForm, it doesn't change the form despite showing new ContentTypeId in the URL.
Below is snippet what I am doing on button click - 


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