I don't know what happened here, but I can tell that over the years I've learned something. Certain brands tend to create a product, say a videocard, and they sell that design for the life of the product. There are no deviations or substitutions. These brands tend to be the 'top' brands, and their products tend to cost more.
Other companies will design and sell a product. Then at some point they may have used up all their supply of heatsinks, so now they go back to the supplier and say "Hey, we need X thousand more heatsinks" and the supplier might say "Sorry, we don't make those anymore" or "Sure, but the price went up". Either way, it puts the videocard company in a tough spot. They can either use another heatsink, or they will have to raise prices to pay for the same type of heatsink because the costs for that heatsink have risen.
Unless you paid specifically because you wanted those pipes, I wouldn't worry about it. Does the card perform and stay cool? That's all that matters unless you really, really wanted those pipes.