Is jQueryMobile ver1.2.0 interchangeable with ver1.1.1?

Is jQueryMobile ver1.2.0 interchangeable with ver1.1.1?

Please teach me if I upgrade my application using jQueryMobile 1.1.1 to using jQuery Mobile 1.2.0, can it work as ever?

I'm simply planning to change my code as follow: 

      <link rel="stylesheet"  href="css/themes/default/jquery.mobile-1.1.1.css" />
      <script src="jquery.mobile-1.1.1.js"></script>

                                    ↓

      <link rel="stylesheet"  href="css/themes/default/jquery.mobile-1.2.0.css" />
      <script src="jquery.mobile-1.2.0.js"></script>

After this change, is my application that was developed using 1.1.1 work safety?

Thanks.