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The main differences are the style, size. Glaze, cover plate also have differences, some flushing methods and water-saving functions and so on.
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Style, some of the models are special prices in the factory, or older styles, cheaper,
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All the same quality, style differences.
There may be a protective layer of oil, try cleaning it.
Now the lock cylinder of the anti-theft door is basically the same, even if it is not the same model of the anti-theft door may open each other, this is like a Rubik's cube will always have the same side, but the probability is very small, if you encounter a different lock cylinder.
It should be the left and right sofas, and I have paid attention to the brand ranking of the 4th China Furniture Industry Annual General Evaluation List, and the left and right sofas are the top ten sofa brands.
Grad integrated ceiling, pretty good. I think you should take a look at it, so that you can have a good idea and choose a good brand.
For the same brand of multi-layer solid wood doors, some styles are still different, and the weight of each style will vary a lot.