Except he is not, he is stronger and quicker, and shoots harder/finishes better (in a nutshell, Guarin is better att offensive tasks), but everything else that a CM needs Nainggolan is more capable at IMO.
He can look like whatever he likes aslong as he comes to us and plays like that.
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He has played as RWB for Inter a little, not a success story, but he is fast and strong, so he was decent there.
Kovacic would been cooler trade, but in terms of productive players they have, it was either Guarin and Ricky as only useful ones, and Ricky is Mazzarri fav.