Are higher rated capacitors interchangeable with lower rated ones?
Higher voltage ratings are probably ok, but it's not great generally to use higher capacitance values unless you know what its for. For the replacements, all you need to do is look for one that will fit on digikey that is 16V 470uF. Digikey will sell you most parts in single quantity. Try this list:
https://www.digikey.com/short/z9q7qt