Yes. Many ram vendors do it. I watched a video on a dude showing how to remove a ram heatsink, a couple of Patriot Viper3 kits, he even states they were bought at the same time, exact same model, color, peg hook, everything. Pulled the heatsinks off and 1 kit was Micron IC's, the other was Samsung.
A lot depends on cost. Crucial is the public house brand of Micron, a ram OEM. Yet you can sometimes find Crucial with SkHynix or Samsung IC's because at that particular time it was cheaper for Micron to outsource the IC's than manufacture its own. It had to fulfill certain contracts for ram numbers, but wasn't under contract as to how.
With G-Skill, there's a contract, certain ram from certain OEM and certain die. G-Skill tests their ram in-house on publicly available mobo's for compatability. Keeping the same OEM, die etc is as close to a guarantee of compatability as it gets.
That's not the full truth, because part of the model number is also the kit specification and color/RGB. You can have the same model that comes in a 1, 2, 4 stick kit or same model one is black the other red. The only thing changing is the spec. So maybe the Blue C15 sticks are B-die, the Black D-die, or maybe just the single stick kits or 4 stick kits. Dunno there.