Change Minecraft world from version 1.15 to version 1.14?

Hi

I have a problem I have a world in 1.15 but I want to play this world with all my structures in 1.14. Is this possible without harming the world?

No, unfortunately this is not possible without damage, since 1.15 contains blocks that do not exist in 1.14.

Ergo: The blocks are no longer recognized as such and displayed, and vlt. Your Minecraft also crashes.

I would not recommend it to you.

Better not do that when I did it, everything I built was gone.