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Veteran
A good question. The cine conversion includes an elaborate housing with an M-mount. Could be the original lens is just sitting inside the housing and can be detached as original. Damned if I know
Generally, a cine conversion for a lens used on a big project like Army of the Dead is an irreversible rehousing. The original housing is disassembled and discarded, the lens elements are cleaned and separated, then put into completely new custom housing.
Other cine conversions are less invasive and include a new lens mount, like for Canon EF, the addition of geared rings to be used with follow-focus motors, and step up rings to make all the lenses fit a standard filter size. But what Zero Optik did for Snyder was a complete rehousing.