Yes, basically a 45MP version of the R3, but lacking the eye-control focus point selector. Hard to say which of those features is the most valuable. I’d guess that most people shooting human subjects, especially sports, would consider the eye-control of the Canon to be more valuable. But for wildlife photographers, who usually need to crop fairly heavily, the extra MP of the Nikon would take the prize.That depends. A 45mp sensor that has a flagship sized buffer (as opposed to the R5's painfully small and slow buffering) would be a significant accomplishment. Basically, it sounds like a 45mp R3, which is what a lot of people wanted from Canon. I give Nikon credit for that. Top of the line flagships aren't groundbreakers as you know, they need to be solid, steady workhorses and it sounds like this will accomplish that.
Decisions will also be heavily influenced by the rather different selections of native MILC lenses offered by each brand, although both will be able to adapt existing DSLR glass with only a fairly minor loss of performance.
But in reality, people already committed to Canon will probably get the R3, and upgrade to the R1 (which presumably will be 45MP or thereabouts), while people already tied into the Nikon system will jump at the Z9. I don’t honestly think many pros or “high end” amateurs will switch brands, as no one really *wants* to switch brands and have to buy a whole suite of new lenses and flashguns. People shooting for a living also don’t want to have to learn a new “alien” camera, if it can possibly be avoided.