Originally Posted by pompousjohn

I guess I better find a source for that, I heard it and repeated it, but it was more like "bottled by". I know they have enough purchasing power to get recipe's customized for a lot of products, even with the original label so I doubt it's identical.

Could even be factory seconds or discontinued sub-brands. Sorry, I repeated hearsay like fact. I haven't tasted it myself and I am not really a vodka connoisseur so wouldn't matter.

There's some discussion here but it doesn't look like anyone is speaking from a position of authority:

Grey goose and Kirkland Signature brand vodka the same?! - Spirits - Chowhound