How to change layout locally?

Question

I want to integrate the corrected exercises into a document. I would like these corrections to be inserted in reduced size (4 pages on one page) without carrying out post processing. Is there a package that allows compiling to change the layout?

I specify, the integrated corrector is not compiled, it is integrated as an external file in .tex format and not pdf. in fact I am looking for the equivalent of pdfpages for .tex files

I think I found an "original" solution that needs to be improved and tested. The idea is to combine the use of tcolorbox and multicols.

How to ensure that all boxes are the same size, that the distribution of boxes is homogeneous?

\documentclass{article}
\usepackage{tikz}
\usepackage{lipsum}
\usepackage[most]{tcolorbox}
\usepackage{multicol}
\begin{document}
\tcbset{colback=red!5!white,colframe=red!75!black}
\lipsum[1-3]
\clearpage
\begin{multicols}{2}
\begin{tcolorbox}[%
width=\textwidth, height=\textheight,scale=0.5,
    enhanced, 
    breakable,
    frame hidden,
    overlay broken = {
        \draw[line width=0.5mm, red, rounded corners]
        (frame.north west) rectangle (frame.south east);},
    ]{}
    \lipsum[1-30]
\end{tcolorbox}
\end{multicols}
\clearpage
\lipsum[4-5]
\end{document}