How to add multiple payment gateway icons?

I tried using the code below but it only allow me to add one new icon. Whenever i tried to use it again, it just overwrites the previous one.

function 123_edd_payment_icon($icons) {
    $icons['url/to/your/image/icon.png'] = 'Payment1';
    return $icons;
}
add_filter('edd_accepted_payment_icons', '123_edd_payment_icon');

function 456_edd_payment_icon($icons) {
    $icons['url/to/your/image/icon.png'] = 'Payment2';
    return $icons;
}
add_filter('edd_accepted_payment_icons', '456_edd_payment_icon');

Sorry im very new with this, any help is appreciated.

Thank you.