Every so often when I download something from the SFM Workshop I get the follow Message:

Workshop File Conflict
Two subscribed workshop items both contain the follow file:
materials\models\weapons\c_items\c_smg.vmt
You can keep the file from the existing workshop item:
TF2: Enhanced SMG
Or overwrite the file with the one from the new workshop item:
Automatic Pistols SMG

Do you want to overwrite the existing file with the new one?

These two items just happen to be very similar in the fact they are two guns but sometimes its completely unrelated models like a vehicle and a cosmetic item

What I would like to know is will this break textures or models by saying yes or no to this? and What exactly is it doing?