What does zombie quality appear to describe?

The launch-day guides use corpse skulls to discuss which bodies may be useful for zombie workers. They report that red skulls are preferable for a zombie where white skulls are more useful to a grave. One guide also links the red-skull count to how many perks a zombie can learn. This is a community report, not an independently checked quality formula for the current full release.

Should you use the same corpse for a grave and a zombie?

The guides describe different priorities for the two outcomes: preserve positive white-skull potential for burial, and consider red-skull potential when choosing a body for a worker. Autopsy is reported as one way to change the body before that choice. The precise outcome depends on the current interface and body state, which this site has not reproduced. Do not sacrifice a body or spend a rare part based only on the general distinction.

Does quality determine work speed?

The collected material does not establish a complete formula for output speed, job eligibility, or perk strength. A guide discusses Mastery and tools as work requirements, while skulls are described as affecting perk capacity. Keep those concepts separate until the current game shows how they interact. Exact caps, quality tiers, and production bonuses remain pending confirmation.