With the old 30 pin that may have been true but this latest lightening cable has a chip in it which affects its performance. However, whatever code that pin contained, the Chinese [being the boy wonders they are] managed to break it. I purchased 3 on ebay - one worked perfectly, another was a bit temperamental and the last didn't work at all. But ebayer remedied the situation immediately and replaced two. I now have three which work as well as the original. Whether the two dodgy ones were because of the chip, I don't know and for the record, they were dodgy when plugged into the mains not the computer.
If they can be purchased from Amazon, I would purchase them without worrying. If you get one that is a bit temperamental, just return it and exchange it for one that is not. I think the risk you run when buying third-party electronics such as these lightning leads, is that they may or may not be temperamental unlike the original which is guaranteed to work all the time.
At the end of the day, I think the third-party lightening leads are fine and well worth the savings one makes when buying them.