The Ingenious Professional replacement gearbox is a replacement centre component, not a complete multipoint locking strip.
The listed references are CA-1001-T and CA-1003-T. A shared Ingenious name or a similar centre-case outline is not proof of fit across Professional and Duplex locks.
Confirm follower springing, any latch holdback, the handle/spindle arrangement and the drive connections for the exact supplied case. Do not transfer those features from a different full-lock drawing or the 30mm 1031-SPG assembly.
Match the exact original case and lock generation, backset, spindle arrangement, case outline, drive connections and retaining fixings. Matching the brand or a single measurement does not establish a direct replacement.
A centre-case repair can retain the locking strip only when the replacement is an exact match and the strip, remote locking points and frame keeps remain serviceable. Have the fault and the complete assembled lock checked before assuming that the gearbox alone is sufficient.