I don't know the difference. I have a hard copy titled CT225, CT230, CT235 Service manual. About 2" thick.
It seems there are 3 manuals- the 'day-to-day' Operations & Maintenance manual: Compact Tractor- Ops & Maintenance Manual, the service manual for repairs: Compact Tractor - Service Manual, and the parts manual: Compact Tractor - Parts Manual (also browsable on-line: Bobcat Genuine Parts Catalog – Official Bobcat Company site ). They're pretty expensive from the official source, anyone selling cheaper copies is probably pirating them.