how to change specific forge version?

I dont mean change from 1.16.5. to 1.18.2, i mean:

 1.18.2 40.1.0 to 1.18.2 40.3.0. 

So i can run an old gecko lib version in mcreator 2023.1. PLS i really need help with this so i can continue with my mod that i am working on for now 2 or 3 years.