Is the Magento site design linked into its database in anyway? Meaning if I move a new magento site in on top of the current on, will the existing database make a difference cosmetically?
In addition to @Cags answer:
There can also be an override of the Design under
System > Design. You should also check this setting.
The Design Package / theme is set in the database. Therefore if there are multiple packages and/or designs in the code, yes, changing the database could change the appearance of the site. The configuration for this is under
System > Configuration > Design.