Exponentcms Exponent CMS

We have many 'things' like modules, etc... which can be customized and placed inside the theme folder. Need to confirm that if you copy a 'thing' and keep the same name it won't cause Exp to crash due to duplicate class names.

• user profile extensions
• module controllers
• module models
• config files that are for the 'other' view (system vs custom), e.g., one has a config, other doesn't...how does the system act?