I wasn't able to find a bike shop nor an Abus lock dealer that could order keyed alike locks.
I just stumbled over this
Abus Keyed Alike Locks
We built this tool out to make Keyed Alike Lock ordering easier. In order to process your keyed alike lock order enter the key number of your lock, this will be 6 digits for a Plus Lock or 7 for an Xplus lock (including the leading X). If you'd like to order new locks without a specified key...
propelbikes.com