My advice: Do not get caught up in 'native 4k' and more pixels are better. This is a huge mistake.
Unless the projector has the optics to represent the 'native 4k panels' then you do not have a native 4k image, only blur.
A good 2K projector with a decent lens will out perform ANY 4K projector with an average lens. Fact.
You will notice there is a limited about of 4K projectors on our site these days. This is because native 4K has been a disaster worldwide. All fine if you're not looking and just happy to have a 'native 4K' projector. But there is much more to image fidelity than the amount of pixels on the screen. This is something the retailers won't tell you.