Usually they color match.

Bottom line on kits, they are good if you have 1 or 2 machines and just want someone to do all the homework for you and just get what you need. That is what your paying for, convenience. You are paying for someone else to do all your homework.

But if you own more than a few, its cheaper to just buy in bulk and play around. Don't like the 10 specific bulbs for machine A, machine C looks just fine with them, no waste.

Or if you like researching, see what other have used, crawl through forum posts, read reviews, build long shopping carts full of different bulbs, then stay away from kits.