Select Another Edition to compare the application edition loaded in your image with a different edition in the library.

Selecting an application and Changes > Another Edition opens a list of editions.

From the displayed list of editions, select an edition or version other than the one with an asterisk (*) beside it. That one is already in your image. Then, select OK.

In the displayed Changes Browser, compare the editions' contents. If the edition in the library has what you want to work with, select Load Alternatives from the appropriate menu.

For detailed information on comparing applications, refer to the Smalltalk User Guide.