Merge backups made with Titanium Backup

I recently had a catastrophe with my SGSII and while the phone is at samsung, trying to revive it, I'm using an old Galaxy Spica.
Prior to the fatality, i made an automated backup, so I know all my apps and configs are there (I have programmed them to be made daily at night)
After a month using the spica, I might recover the phone soon (fingers crossed), so i wonder if there is a way to restore the SGSII backup and add whatever has been changing while i'm using the spica.
Maily, the whatsapp's conversations and sms....
Is it possible to merge two backups into one so I don't lose anything? What solution do you recommend? Perhaps some other app?

Thanks!

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