Some small differences from originals that can be found but the sizes & measurements are good.

On the side of the 2 front pouches, you have small pockets on the sides for kar98 clips (which fit perfectly) but 1-2 buttons seems to not close perfectly, with just a slide of the finger on the button and it opens.

The backpack is good, nothing much to say, except from the small differences you can find on the straps depending on which version you can find from originals.
The closing system might seems complicated at first but it's not that hard.

In the end not disappointed about my purchase.
You just need to know that you'll need 2 WH belt sling, stamped to attached the 2 fronts pouches to your Y-Sling.