KBA Planeta 104 vs. 105

Dear All,

We are researching the evolution of the KBA-104 to KBA-105 and specifically the technical changes that were introduced in the KBA-105 upon introduction in the market in 1998.

Can anyone direct me to a document/paper/research/marketing material that highlights the differences between the 104-4 SW2 and early models of 105-4 SW2.
Any published information or website can help.

Thank you in advance.