Adding Warm Reheated Milk to Room temperature Milk

Hi mummies! I have a bottle of fresh milk (that has never been refrigerated) and my daughter has only drank half after 1 hour so I would like to top up some milk to make her drink more. May I know if I can add refrigerated milk that is still slightly warm from reheating to the bottle of room temperature half drank fresh milk? Thanks in advance, ladies!