From what I know, and correct me if I'm mistaken, there isn't a way to keep both textures and use them simultaneously. However, ye' can save the original texture, or both of them, and make a copy of each so ye' can swap out the textures whenever ye'd like to do so. Just be sure to save the copies in a seperate folder so ye' won't lose them nor have to worry about messin' up yer FeralHeart files.
This is different if yer talkin' about makin' a map for ye' can simply re-texture the cave objects yer placin' within yer map(s).
Lastly, it would seem this is in the wrong section. This belongs in the child board Game Help. I'll get a staff member to move this thread for ye'.
No problem. Glad I could be of assistance. If ye' need any additional aid, feel free to inform me.
-moving this to Game Help- QvQ