Not the same, the warranty commitment letter, is a manufacturer's commitment, and is limited to the warranty period. And after-sales service commitment letter is a store or supermarket, to improve their competitiveness with a commitment to customers, can be lifelong, can also be in the warranty period, the time is to have the sales unit set their own, the fundamental difference between the two is that one is a manufacturer, one is a business.
In addition, I can say, I do engineering, warranty period commitment is issued by the construction unit, after-sales service commitment letter is issued by the developer. Hope to adopt