Of course,
This is what the db_field_definitions.php looks like, here I use different amountprices.
$additional_image_fields['amout1'] = array($lang['amount1'], "text", 1);
$additional_image_fields['price1'] = array($lang['price1'], "text", 1);
$additional_image_fields['amount2'] = array($lang['amount2'], "text", 1);
$additional_image_fields['price2'] = array($lang['price2'], "text", 1);
$additional_image_fields['amount3'] = array($lang['amount3'], "text", 1);
$additional_image_fields['price3'] = array($lang['price3'], "text", 1);
But to make it not to difficult I think it is better to sea firt only the following sense:
$additional_image_fields['price1'] = array($lang['price1'], "text", 1);