I have 4 \begin{bmatrix} matrices. Because the matrix values are different the overall 4x4 matrices have different column widths. Is there a way to align them so that all columns have the same width so that the matrices look symmetric?

```
\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{mathtools}

\begin{document}

\begin{align*}
\Phi_{1} &=
\begin{bmatrix*}[r]
0 & -\pi & -\pi & 0 \\
\pi & 0 & 0 & \pi \\
\pi & 0 & 0 & \pi \\
0 & -\pi & -\pi & 0 \\
\end{bmatrix*}
&
\Phi_{2} &= 
\begin{bmatrix*}[r]
0 & 0 & -\pi & -\pi \\
0 & 0 & -\pi & -\pi \\
\pi & \pi & 0 & 0 \\
\pi & \pi & 0 & 0 \\
\end{bmatrix*}
\\
\Phi_{3} &= 
\begin{bmatrix*}[r]
0 & -\pi & 0 & -\pi \\
\pi & 0 & \pi & \pi \\
0 & -\pi & 0 & -\pi \\
\pi & -\pi & \pi & 0 \\
\end{bmatrix*}
&
\Phi_{4} &= 
\begin{bmatrix*}[r]
0 & -\frac{\pi}{2} & -\pi & -\frac{3\pi}{2} \\
\frac{\pi}{2} & 0 & -\frac{\pi}{2} & -\pi \\
\pi & \frac{\pi}{2} & 0 & -\frac{\pi}{2} \\
\frac{3\pi}{2} & \pi & \frac{\pi}{2} & 0 \\
\end{bmatrix*}\\
\\

\end{align*}

\end{document}

```

[![which results in this](https://i.stack.imgur.com/15k7r.jpg)](https://i.stack.imgur.com/15k7r.jpg)