Two different Program versions at same time

Hi all,

I’m currently working with version 6.10 on an Imac with Windows 10 through Parallels 12.
Everything works perfectly.
Before switching to version 6.20 I wish to use both versions for a short time:
Version 6.10 currently on a C-hard drive in Windows
and version 6.20 on an external SSD disk.
Is this allowed, is it possible and does anyone have experience with this configuration?
Thanks for those who respond!