i suspect it depends on whether or not they showed you a picture or in any way inferred or wrote that it would be identical etc otherwise it is likely to be the common practice of builders licence which means that they may give you plans but if they deviate from them then tough cheddar. unless you have a contract that specifies down pretty much to the final bolt, you will find that they wriggle e.g. plans say block paving, they put down ill matched gravel, they just say it's a driveway, and that's it. I was amazed that even though they are building to plans, they can substitute inferior items at will and there is absolutely nothing you can do about it.
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