One Big Shot Machine by Sizzix comes in the Jewelry Studio. No change in size from any other "Big Shot by Sizzix".
You may be asking why purchase the Jewelry Studio? My reason for purchasing the 'Jewelry Studio' was because of the "bundled" items that are included (a small savings over al-la-carte). Additionally, the platform included with the 'Jewelry Studio Bundle' is an Extended Platform. Regular or standard sized cutting plates are provided with the 'Bundle'.
I hope this is helpful.