CL 3 cylinders diesel


got some puzzle with CL diesel engine pistons, may be someone has an answer.
Ordered and got engine pistons. The piston pins are 21 mm in diameter as it is in parts catalogue (Teikin for examle).
The pins on engine are 22 mm in diameter. Tried to find those, no luck.
If there is any information on this case, please, let me know