From my personal experience, there is a difference in quality between online and offline products.

The packaging of the products shipped online says "shipped by e-commerce", which means they are exclusively for online products. Many styles of online products are not sold offline, so you can't compare them even if you want to. There is also a type of the same style in offline stores, which I have also bought. They are also exclusively for e-commerce, and the style is exactly the same as in the store, but the feel is quite different.