How to sync the data structure of my iPod touch with that of my iPad?
Solution 1:
Sync your iPod Touch configuration back to iTunes and then sync your iPad with iTunes!
For syncing your iPod configuratuon you must only connect it with iTunes. Every time it will be created a backup of the device. After that you connect your iPad (which has been restored to default factory) with iTunes.
Then you can do the following steps which are described on the apple support sites (Restoring your iPhone, iPad, or iPod touch).