As an owner of a 2018 YZ450 snowbike, in my experience the KTM 450’s definitely DO NOT eat my YZ. The only advantage is lower weight on the KTM. But even with my heavier bike and also heavier butt, my yZ with Camso is exactly neck and neck with Buddy’s 18 SX 450 w/Camso. Both bikes engines are completely stock minus thermobobs, engine blankets, and pod-intakes.
I have not ridden them with snow kits yet, my observation was riding them both on dirt.