No, the RD700 display doesn't help. We had a similar discussion in the general arranger forum about using a Ketron module with a Roland BK-9. In order to select the sounds you want in the Ketron module, you need to send a specific midi command from the master keyboard (in your case RD700). You can get the information about the midi command (bank + program change value) for each sound from the Ketron sound list. On the other hand, the Roland RD 700 sound list gives you information about the bank/program change values of the Roland sounds you select. Some of the values might match, so for example selecting a specific Roland e-piano might make the Ketron module select a specific sound (not necessarily e-piano as well!). You certainly won't be able to select all of the Ketron sounds from the Roland, so it's not a satisfactory combination. If you had a keyboard with advanced master functions (e.g. the Yamaha MoX(F) can store master locations including bank/program change values), you could address all Ketron sounds.
If you have an iPAD, it's easy to operate the Ketron from the app 'Set list maker', as this app can store these values for each song in the set list.