I own the Odyssey G9 (not the NEO), and I can confirm that you can use two differents inputs at the same time with the PIP/PIB mode. I use that when using my Macbook Pro with HDMI and my PC with display port. It splits the screen in the middle and gives you the equivalent of two 27" screens.

The only thing to know is that it only goes up to 120Hz mode and not 240Hz with the PIP/PIB mode.

Hope this helps you.

Unfortunately, the thing does not have an integrated KVM switch or USB C (for the laptop). However, it is possible to display images from two different sources at the same time.