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WordPress plugin development: Deliver other page to browser than requested in URL

Solution:

I would create two different pages, each one with the different content. Then, I would use pre_get_posts to get a postid parameter. This way, you won’t have to deal with redirections.

function conditional_change_content_by_id( $query ){
    if( $query->is_page( YOURPAGEID ) && $query->is_main_query() && (isset($_POST["pageid"]) && !empty($_POST["pageid"])) ) {
        $query->set( 'page_id', $_POST["pageid"] );
    }
}
add_action( 'pre_get_posts', 'conditional_change_content_by_id' );