What is the difference between swift zxi and decca

What is the difference between swift zxi and decca

Question asked from: http://www.carandbike.com/maruti-suzuki-cars/swift/vdi-deca-limited-edition

The Decca is just a limited edition model and comes with additional features like Sony multimedia touchscreen music system with Bluetooth and external mic, 6-inch Sony door mounted speakers, and a reverse parking assist
system with camera. No mechanical changes have been made.