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By using nicematrix package and command \Block, I'm struggling to reduce the width and height of block colors, separately. Any hint? Below, find the code:

\documentclass{article}
\usepackage{nicematrix,tikz}

\begin{document}
\begin{equation*}
    \begin{bNiceArray}{cccc|c}[columns-width=5pt,margin]
      \Block[fill=red]{2-4}{} a_{11} & a_{12} & a_{13} & a_{14} & \Block[fill=yellow]{3-1}{} a_{15} \\
      a_{21} & a_{22} & a_{23} & a_{24} & a_{25} \\
      a_{31} & a_{32} & a_{33} & a_{34} & a_{35}
    \end{bNiceArray}
\end{equation*}

\end{document}

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Here is a suggestion:

\documentclass{article}
\usepackage{nicematrix,tikz}

\begin{document}
\begin{equation*}
    \begin{bNiceArray}{cccc|c}[columns-width=5pt,margin]
      \Block[tikz={fill=red,offset=1.5pt}]{2-4}{} a_{11} & a_{12} & a_{13} & a_{14} 
        & \Block[tikz={fill=yellow,offset=1pt}]{3-1}{} a_{15} \\
      a_{21} & a_{22} & a_{23} & a_{24} & a_{25} \\
      a_{31} & a_{32} & a_{33} & a_{34} & a_{35}
    \end{bNiceArray}
\end{equation*}

\end{document}

Output of the above code

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