PHP-FPM Does the size of PHP Opcache increase linearly with number of Xenforo installs?

Curious if anyone knows what happens when you stack multiple Xenforo installs on the same server... does the Opcache share the compiled cache across the sites where the code contents are the same or does it create separate caches for each XF install since they're in separate locations in the filesystem?

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Yeah, I've been monitoring, and it's increased some, but not as much as I expected. Nothing definitive either way that I've observed.