If its art assets you can export the assets in content folder to fbx or targa file, and reimport back into the older engine version, and copy/ remake the material noted, but it really not worth the time if its a very complex material.
If its art assets you can export the assets in content folder to fbx or targa file, and reimport back into the older engine version, and copy/ remake the material noted, but it really not worth the time if its a very complex material.