I would like these two nodes to be the same size -- the size of the smaller one. In essence I'd like to be able to set maximum size=6mm
but there is no such option. How can I do this?
\documentclass[tikz, border=10]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\tikzstyle{mystyle}=[circle,minimum size=6mm,draw=black,fill=white]
\node (9) at (0,0) [mystyle] {9};
\node (10) at (1,0) [mystyle] {10};
\end{tikzpicture}
\end{document}