How about Royal Canin Renal LP?
The foods in stores will be at least 18% protein. Actual renal diets are a bit lower in protein. The Preference would have a very low protein % or none at all (there will be a little from grains and such). It isn't balanced for long-term feeding though.
If you want to homecook, it would be best to talk to a board certified veterinary nutritionist. Dr. Remillard out of Angell is or was doing a study on renal disease (I think relating to diet). She would be a good one to consult. The Royal Canin may work well though.
The soft pieces in kibble may be meat, but more likely they are just designed to look like it (done to make the food look more appealing to people so they want to give it to their animals...). It's probably a very similar make-up to what is in the rest of the food.
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