In fact, there isn't need to rename files. You can simply open up the appropriate .cal3d file in a text editor and change things there. This is changing one file instead of two in this case, and nicer to do in all cases.
Regardless of what you do, you need to save the .zip afterwards, and restart PS so it loads the new configuration. If it isn't able to read the files (which would be the case if you didn't get the spelling / name correct), then it would either crash or not do the animation. In no case will it find it if it's even just slightly misspelt. If you accidentally created a copy, maybe you edited the wrong file or somesuch? Possibly you copied it inside the .zip instead of renaming, and / or the folder names inside are wrong? The system is pretty unforgiving.