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 ...
       \DTLforeach*[\value{DTLrowi}<10]{CsvTabelle}{% 
       \SpI=Column1,\SpII=Column2,\SpIII=Column3,\SpIV=Column4,\SpV=Column5,\SpVI=Column6,\SpVII=Column7,\SpVIII=Column8,\SpIX=Column9,\SpX=Column10,\SpXI=Column11%
       }{% 
       \DTLiffirstrow{\\\midrule}{%
        \ifthenelse{\DTLiseq{\SpI}{3}\or\DTLiseq{\SpI}{6}}{\\\midrule}{%
          \ifthenelse{\DTLiseq{\SpI}{5}}{\\\rowcolor{green}}{\\}}}% 
       \SpI&\SpII&\SpIII&\SpIV&\SpV&\SpVI&\SpVII&\SpVIII% 
       }% 
       \DTLdeletedb{CsvTabelle} 

 ...
      \DTLforeach*{CsvTabelle}{% 
       \SpI=Column1,\SpII=Column2,\SpIII=Column3,\SpIV=Column4,\SpV=Column5,\SpVI=Column6,\SpVII=Column7,\SpVIII=Column8,\SpIX=Column9,\SpX=Column10,\SpXI=Column11%
       }{% 
       \DTLiffirstrow{\\\midrule}{%
       \ifthenelse{\equal{\theDTLrowi}{3}}{\\\rowcolor{red}}{\\}}% %
       \SpI&\SpII&\SpIII&\SpIV&\SpV&\SpVI&\SpVII&\SpVIII% 
       \ifthenelse{\equal{\theDTLrowi}{3}}{\dtlbreak}{}%
       }% 
        \DTLforeach*[\DTLisgt{\SpI}{3}]{CsvTabelle}{% 
       \SpI=Column1,\SpII=Column2,\SpIII=Column3,\SpIV=Column4,\SpV=Column5,\SpVI=Column6,\SpVII=Column7,\SpVIII=Column8,\SpIX=Column9,\SpX=Column10,\SpXI=Column11%
       }{% 
       \DTLiffirstrow{\\\midrule}{% 
       \ifthenelse{\equal{\SpI}{5}}{\\\rowcolor{red}}{\\}}%
       \SpI&\SpII&\SpIII&\SpIV&\SpV&\SpVI&\SpVII&\SpVIII% 
       \ifthenelse{\equal{\SpI}{5}}{\dtlbreak}{}%
       }% 
       \DTLdeletedb{CsvTabelle}
...

\documentclass{scrartcl} 
\usepackage[utf8]{inputenc} 
\usepackage{booktabs} 
\usepackage{array} 
\usepackage{rotating} 

\usepackage{varwidth} 
\newcommand{\rcel}[1]{\rotatebox{90}{\begin{varwidth}{5cm}#1\end{varwidth}}} 

\usepackage{datatool} 
\DTLsetseparator{;}

\usepackage[table]{xcolor}

\begin{document} 

\DTLloaddb[autokeys,omitlines=5]{CsvTabelle}{tableA.csv} 
\edef\spalten{\DTLcolumncount{CsvTabelle}} 

\begin{table}[hbtp!] 
     \footnotesize 
     \centering 
       
     \begin{tabular}{*{12}{r}} 
     \toprule 
     \rcel{Austritts-\\Geschw.}& 
     \rcel{Drehzahl} & 
     \rcel{Breite Ver-\\jüngung} & 
     \rcel{Verjüngte-\\Fläche} & 
     \rcel{Verjünguns-\\Faktor} & 
     \rcel{Druck-\\Verlust} & 
     \rcel{Leistung\\n. Messung} & 
     \rcel{Leistung\\inkl. Steig.} \\ 
     $[$m/s$]$&$[\frac{1}{\mathrm{min}}]$&$[$m$]$&$[$m$^2$$]$&$[$-$]$&$[$Pa$]$&$[$W$]$&$[$W$]$ 
     \DTLforeach*{CsvTabelle}{%  
       \SpI=Column1,\SpII=Column2,\SpIII=Column3,\SpIV=Column4,% 
       \SpV=Column5,\SpVI=Column6,\SpVII=Column7,\SpVIII=Column8%  
     }{%  
     \DTLiffirstrow{\\ \midrule \rowcolor{green}}{\\}%   
     \SpI&\SpII&\SpIII&\SpIV&\SpV&\SpVI&\SpVII&\SpVIII % 
     } 
     \end{tabular} 
     \DTLdeletedb{CsvTabelle} 
\end{table} 

\end{document}