Die erste Vorlage ist DIN A4 aus dem scrguide.pdf.
\documentclass[a4paper,fontsize=11pt,twoside,toc=listof,open=any,headings=small,parskip=half-,headsepline,BCOR=12mm,DIV=15]{scrbook}
\documentclass[paper=240mm:165mm,fontsize=10pt,twoside,toc=listof,open=any,headings=small,parskip=half-,headsepline,BCOR=10mm,DIV=20]{scrbook}