Hi,
The issue is very simple,
IAP 93 is Orion and IAP 115 is Pegasus, both are different hardware therefore they are not able to sync.
you have to upgrade the code either mannually or through Airwave.
while updating the code, ensure that you are choosing the right code, i.e for IAP 93 choose Orion (ArubaInstant_Orion_6.3.1.8-4.0.0.7_44641) and for IAP 115 choose Pegasus ( ArubaInstant_Pegasus_6.3.1.8-4.0.0.7_44641) .
to console any IAP default admin password is admin.
hope got some clarity, please feel free to comeback for any further help on this.
Cheers,
Venu Puduchery