Copy Paste from older files shouldn't override new with old settings

[Josh Verran]

Copy Paste from older files shouldn't override new with old settings
For example I have an expression based property, during the development of our resources, that property (expression) has been altered/improved. If someone copies an element from an old file which has that same property and pastes it to a new file, the new property is overridden with the old. By default older should not overwrite newer.