Compare the versions, then add the lower version agent-plugin.xml unique properties to the higher version agent-plugin.xml properties.
$LOWVERSION_SYBASE/UAF-2_5/nodes/<Host Name>/plugins/<Cluster OR InstanceName>/agent-plugin.xml with $HIGHVERSION_SYBASE/UAF-2_5/nodes/<Host Name>/plugins/<Cluster OR InstanceName>/agent-plugin.xml,
For example, copy following property from lower version xml file to higher version xml file.
<set-property property="ase.database.devices" value="[1,sysprocsdev,/work/river/ase1501ce/data/sybsystemprocs.dat,150,135;0,master,/work/river/ase1501ce/data/master.dat,80,60;2,systemdbdev,/work/river/ase1501ce/data/sybsystemdb.dat,12,12;3,lstdb1,/work/river/ase1501ce/data/lstdb1.dat,50,50]" />