I have determined from research that since the K98 was not adopted
until 1935, the fact that my rifle was made at AMBERG in 1917 then
reworked in 1934 That this rifle must be one of the Kar.98AZ or Kar.98a
versions. This might explain why the bolt shroud and cocking piece
do not interchange perfectly with the Turk KaKale bolts.
SO, when I am looking for new cocking piece and shroud parts, do I need to specify for Kar.98AZ and Kar.98a rifle bolts ?
The Kar 98AZ and the Kar 98a are the same. It takes the same bolt as the Gew 98 except the Kar bolt handle is bent. The bolt shroud and cocking piece are the same on all of them.
You have discovered why the bolt parts were numbered with a serial number. They were not truly interchangeable parts and the same numbered parts should be kept together. Sometimes a different numbered part will fit and sometimes it won't. The Czechs controlled the tolerances closely enough that their bolt parts (other than the bolt body) did not need to be numbered. The Germans did not.
Gew 98 bolt shrouds and cocking pieces you buy may fit - or they may not. Try enough and one will work.