As both MBOX and PST file formats are different from each other. There is a manual method to convert MBOX file to PST format but it's taking a lot of time. If you want to convert MBOX into PST manually, then see this blog:- migrateemails.com/2015/08/19/convert-mbox-mail-into-outlook-pst-with-mbox-to-pst-converter
If you find an easy way to convert MBOX file into PST format so I recommend you to use MBOX to PST converter tool which provides batch mode feature & many more too.
You can download the free trial version of this tool, here:- convertmbox2pst.com