Of cousre this is example and you will have to change class id to correct. The trick is with using the same file MatchFile=full/product_full.tpl but with different matching and name in []
Ad.2
When you using admin interface for creating templates, new template files are stored in design/corporate/override/templates. If you want organize them in folders you will have to change entries in override.ini.append.php file for MatchFile.