8230040 is the classic RhB Krok for the LGB or Marklin/LGB model
8230230 is the Bernina Krok, no side rods, that was made by KISS.
As for installation it was simple on the LGB build and I'm not aware Marklin have changed it. You'd need some LGB spade connectors to connect the eight track and motor pins to the decoder and from memory a LGB interface cable to connect the lights. I'll check the dcc thread
Here we go though you need to ask Mike to see what happened to his pictures
http://www.gscalecentral.net/decoder-fitting-guides/chipping-a-lgb-crock-for-gorden/