Button position depending on situation or always in the same position?

I have two situations:

1. A page with a table. The table can be short or long depending on user preference (items per page).
2. A page with a form. The form can be short or very long depending on some dynamic data.

I need to place a few things in each page:

1. A back button.
2. A search field.
3. One or two secondary buttons.
4. A primary button to save user input for the case "page with a form" and open a modal containing a form when we have the case "a page with a table".

My questions are:

1. Should I keep same position for the buttons whatever the case is? Or should I treat each case separately and for example put the buttons for the "form case" after the form on the left side and keep them top-right for the "table case"?
2. What do you think about the current order I have? Back button, search, page title, buttons? The back button will not exist in other pages so the search will be the left most in that case.

Thank you.