Looks can be deceiving. Although the pattern of the Arcam shares an almost similar resemblance to the Audionet Watt, it looks plasticky cheap with the soft looking plastics of the panels. Just by looking at the Arcam you can sense it's a cheap AVR amp. Scrutinise the details and the weight of the Arcam is 10.25kg which is less than some budget integrated amps despite its £2,499 price tag. On the other hand the Audionet Watt is made from solid chunk of metal. Look at the details of the front panel. It's textured steel/metal. At 25kg the Watt is more than twice the weight of the Arcam.
In summary, the Arcam looks cheap and the Audionet looks solid expensive. They don't look the same too me at all even by judging from the photos, especially the build quality. In real life if they are placed side by side I think the differences may be even more apparent.