There are some 15 nozzle types for about 10 KCA-type bosch injectors. Do these nozzles have same dimensions and can be physically fitted to any kca injector?
probably, but the IDI vw's only used 3 different types afaik
dn0sd293 was the most common, 193's are about the same but were from the early 1.5's.
Using the wrong nozzles may not make a difference, but it won't help.