Wie kann ich den Spaltenabstand in einer TikZ-Matrix zeilenweise ändern?

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%\documentclass[]{article}
\documentclass[border=5pt]{standalone}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
%\usepackage[german]{babel}
\usepackage{tikz}
  \usetikzlibrary{matrix}
\begin{document}
\begin{tikzpicture}[
commonstyle/.style={align=center, rectangle, draw, rounded corners},
parentstyle/.style={commonstyle, fill=lightgray, minimum width=12em, minimum height=5em, font=\bfseries},
childstyle/.style={commonstyle,  fill=none, minimum width=8em, minimum height=2em,}
]
% Inhalte
\def\Par{|[parentstyle]| Gesenkschmieden}
\def\ParL{|[parentstyle]| {Gesenkschmieden teilw.}}
\def\ChLiL{|[childstyle]| Bezeichnung}
\def\ChLiR{|[childstyle]| Bezeichnung}
\def\ChLiiL{|[childstyle]| Bezeichnung}
\def\ChLiiR{|[childstyle]| Bezeichnung}
\matrix[matrix of nodes, nodes in empty cells,
font=\footnotesize,
nodes={align=center, text width=8em, anchor=center},
inner sep=5pt, 
row sep=2em, 
%column sep=1em, 
%column 1/.style={anchor=base east},
%column 2/.style={anchor=base},
%column 3/.style={anchor=base west}
] (m)
{
           &       &          & \Par \\
           & \ParL &          &\\
\ChLiL     &       & \ChLiR   &\\
\ChLiiL    &       & \ChLiiR  &\\
%A & B & C &  D &  E    & F & G \\
};
 
 
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