Is there a way in F5 LTM to verify changes before sync

You can compare the configuration by using comparison software ex: diffmerge

create two new worpad files( for two devices) for logging through putty Before logging to device using putty provide wordpad file ( under logfilename for session logging). Now log on to the device run cat bigip.conf command " which opens the config file " this will we logged on your word pad file Repeat the same command on the other device.

Open two logged wordpad files on Comparision software for comparing the configuration.

Note if you have more than one partition you should open bigip conf file on each partition separately