Space between parts and indices in KOMA script (in the TOC)

Question

Consider the following code:

\documentclass{scrbook}
\begin{document}
\frontmatter
\tableofcontents
\mainmatter
\chapter{Introduction}
\part{A}
\chapter{First}
\chapter{Second}
\chapter{Third}
\part{B}
\chapter{First}
\chapter{Second}
\chapter{Third}
\appendix
\chapter{Appendix}
\end{document}

As expected, there is a lot of space between Introduction and Part I, as Introduction does not belong to Part I.

However, there is little space between Part II and the Appendix, even though Appendix does not belong to Part II.

Is it possible to make the space between Part II and Appendix as large as the space between Introduction and Part I?

I know I can do this manually Space between conclusion and appendices in ToC, but I need to guess the correct spacing.

Answer 1

Instead of an appendix chapter use a appendix part. I added blindtext, because I got (in other examples) strange results with lists of chapters. However:

\documentclass{scrbook}
\usepackage{blindtext}
\begin{document}
\frontmatter
\tableofcontents
\mainmatter
\chapter{Introduction}
\blindtext{}
\part{A}
\chapter{First}
\blindtext{}
\chapter{Second}
\blindtext{}
\chapter{Third}
\blindtext{}
\part{B}
\chapter{First}
\blindtext{}
\chapter{Second}
\blindtext{}
\chapter{Third}
\blindtext{}
\appendix
\part{\appendixname}
% \chapter{Appendix}
\blindtext{}
\blindtext{}
\end{document}