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To modify the notification text when clicking on the add to cart button before selecting a variation in Woocommerce, you can use the following code snippet in your functions.php file:

add_filter( 'woocommerce_variation_is_active', 'custom_variation_is_active', 10, 2 );

function custom_variation_is_active( $active, $variation ) {
    if ( ! $variation->is_in_stock() ) {
        $active = false;
        wc_add_notice( __( 'Please select a different variation.' ), 'error' );
    }
    return $active;
}

This code will display the "Please select a different variation" message when the user clicks the add to cart button before selecting a variation. You can modify the message to suit your needs by changing the text inside the __('...') function.