This document lists the differences between the English CPC's and the German CPC's.
The machines distributed by Schneider had their logo on them. In addition, the monitors and some peripherals were also re-branded as "Schneider" e.g. Schneider DDI-1.
Amstrad later took over the sale of CPCs in 1998, and these had the Amstrad logo on them.
The second disc drive is also a 36-way female centronics type. There are two useless pins, numbered 35 and 36, if you follow the numbering scheme of Amstrad/Schneider. All other connections are the same as the English CPC6128. The manual doesn't reflect this difference and the picture of the back of the computer shows a PCB connector and is documented as if there are only 34pins.
All other connectors are the same. (joystick, stereo sound, monitor and power).
Corrections to this document by Hauke Hagenhoff. Many thanks!