Can I have a conditional MySQLi insert based on PHP if statement

I am trying to use a single .php page to have a conditional MySQLi INSERT based on user role. Basically, the INSERT is very similar with the exception of a couple of fields. Here is my code:

require 'scripts/config.php'; 

            if ($_SESSION['role'] == 'admin')
                 { 
                SQL Option 1 INSERT/PREPARE/BIND/EXECUTE .....
                 }


            if ($_SESSION['role'] == 'client')
                 { 
                SQL Option 2 INSERT/PREPARE/BIND/EXECUTE .....
                 }

What happens is that regardless of the user $_SESSION, both INSERT statements execute. One entry is blank and the other has the correct data based on the form submitted.

My form is the same with the exception of a couple of conditional fields that are different based on admin vs client.

Can I do this or do I need to go back to the original script that has two different .php pages that contains the INSERT statement for admin vs client like this:

            if ($_SESSION['role'] == 'admin')
                 { 
                  header("Location: admin.php")
                 }

            if ($_SESSION['role'] == 'client')
                 { 
                  header("Location: client.php")
                 }