Board Thread:General Mod Discussion/@comment-32497263-20180608154120/@comment-31507215-20180612181239

Are you changing the texture inside the mod .jar file, or are you making a resource pack that includes the texture you are changing?

As Kawolski said, if you change an item texture, all occurences of that item will appear to you with that texture, but if you make a resource pack, you can toggle your texture on or off, depending on what you want.