I don't tink there are "working lines" in csw, because even with the best csw you can't achieve the best results in any activity (except tracks).
Ok, there are better csw (well balanced character, self confident)and worser csw (shy or too aggressive).
I think the main difference is if a dog can BITE (very sef confident and fearless). With a dog that bite you can do
any sport activity, with a dog that don't bite you can't do any protection work.
So called "working dogs" are in Czech Rep, but are in other country too...in Italy we have many dogs with exams in protection work (some IPOs too), rescue dogs and so on.
For my (little) experience the dogs character is important, but the biggest part is to the owner. THIS is the main difference...in Czech for the people is normality "working with dog"!
In Italy this is an exception !!!

Two weeks ago in Italy (Pavia) we organized THE LARGEST OFFICIAL BONITATION til 1994 (
41 dogs) and although main part of dogs passed the test with good character, was clever to the judge that 90% of dogs
has never work in any way.
Almost 90% of dogs weren't prepared at all for the bonitation but the results were overally good.
Good dogs aren't only in czech repuplic... only good owners are.