I'm fairly certain yes. Liver is very nutrient rich and can also be high in toxins if from a bad source. Have you considered a raw diet without a grinder? I've seen a lot of information from cat owners that feed a raw diet without supplements or grinding the food. They basically just give a whole chicken leg or what have you. I imagine it would be more convenient. You MUST ensure your cat is getting enough taurine which is more critical than anything you do. Chicken hearts are a fantastic way to meet that goal. I believe the rule of thumb is that 30% of what raw food you feed to your cat should be organ meet and the remaining 70% should be muscle meat. The recipes I have found call for that 30% to be 1/3 liver and 2/3 heart.
Here is very good info and exact data on how much taurine your cat needs daily.
http://www.vetinfo.com/cat-taurine-requirements.html#b
Here is a website that recommends raw food without grinders.
http://www.rawfedcats.org/
This link that recommends chicken hearts for taurine. Interestingly enough I could not find exact data on how much taurine is in a chicken heart. This article says 7 a day of just chicken hearts (not recommended) would meet your cats needs. The article goes on to recommend three a day along with other taurine sources such as liver and bone.
http://feline-nutrition.org/answers/answers-how-much-heart-is-too-much
This is a study that attempted to collect taurine content in various animal parts. Again they have no direct information about a CHICKEN heart. They do however, have information about taurine content for chicken heart and chicken liver together. I'm not exactly sure how that works.
http://www.vetmed.ucdavis.edu/vmb/aal/pdfs/spitze.pdf
I would look into whole part raw diets and supplement with 30% of the total weight chicken heart (2/3) and liver (1/3). You could get some poultry shearers and cut chicken thighs up into whole chunks to make it a little easier on your cats.
http://www.amazon.com/OXO-Grips-Spring-Loaded-Poultry-Shears/dp/B000PGG7ZQ/ref=sr_1_1?s=home-garden&ie=UTF8&qid=1377498950&sr=1-1&keywords=poultry shears