and the wireless use is not limited to the PC, but can be switched back and forth between Bluetooth (mobile phone/tablet) and 2.4Ghz dongle (PC) via 2 buttons on the keyboard. I find this very practical for quickly writing something on the mobile phone.
There is another difference, but only in terms of appearance. The aluminium alloy is processed differently in each case, and the G915 is more stylish in my opinion. This is visible in the product photos, but it is easier to see in comparison videos on YouTube.