Palworld Mod Idea: Is it okay to bring back DarkMutant and the other unreleased pals with a previous version of game?

[Wolphgong]

Hello,

I have been looking around and tinkering with some things with Palworld on Steam, and I got to really wondering if it was possible to use a previous version of Palworld, for example version 0.1.5.1, to integrate the unreleased pals back into the game. Currently, I can only get the old version to work in place of the updated modern version 0.3.12 after a lot of tinkering, but I still cant make a proper mod to get it to do what I have been wanting. So that's where I come to see in this form if it is possible to bring back the DarkMutant and Pals to the newest version of Palworld. Provided is the Steam console command to download the old version of Palworld 0.1.5.1 as of 12/04/2024: download_depot 1623730 1623731 2991472455664525389 

edit: Benefits would be that you can have DarkMutant, BlackFurDragon, and ElecLion as available pals as well as the Sakurajima update. 
I am truly curious if it is possible, can't wait to see! 

Edited December 5 by Wolphgong
edit: Benefits would be that you can have DarkMutant, BlackFurDragon, and ElecLion as available pals as well as the Sakurajima update.