I think that even if you have minimal voltage drop for 3 units daisy chained youd still have enough head room w a 20V driver.
I treat same model different cct as same voltage. Unless they are from a strange manufacturer or there are bins asociated with the product.
Serial? If there are differences then they would be amplified by more repetitions. Not sure if this is what youre talking about.
I did vestas 2 spectrums 2700/5000k in parallel but on low current. No problems, nothing blew up, but i did have juicy sinks. But ive seem teknik saying avoid different ccts on same parallel circuit. But i think it also had to do with that the guy he was advicing was doing it for spectrum, like some warm and some cold intead of going for all neutral white.