So two photons leave a lit candle:Thank you my point exactly the plant see's no light and if there was no eye to see then light would not exist only energy that can do other things like photosynthesis and provide heat. Heat is real when there is matter no matter no heat no eye no light.
One enters the eye of an animal and it perceives light.
One enters a plant leaf and is used in photosynthesis.
Were those two photons any different? When the candle "made" them, did it know where they would end up and make them different in some way?
Yes or no please: are the photons - in flight - any different from each other?