Sindbaaad Does this mean that exactly the OEM unlockable version of Pixel phones is the international version?
I'm not sure what "international version" would mean (I suspect there are multiple non-USA versions). There are definitely USA-targeted phones that are OEM-unlockable (I have one), and USA-targeted phones that are not OEM-unlockable (every phone sold for/via Verizon Wireless, for example).
In the USA, there are some sales channels that reliably sell OEM-unlockable Pixel devices. A device sold as "unlocked" by the Google Store will be OEM-unlockable. There are multiple reports that a device sold as "unlocked" by Best Buy will also be OEM-unlockable. Meanwhile, there are many sellers who do not understand the difference between carrier-unlocked and OEM-unlockable, who sell carrier-unlocked devices as "unlocked"; some of those devices are not OEM-unlockable.