Written in 1984, six years before the publication of Jurassic Park, Carnisour unleashed dinosaurs brought back from extinction on the world. Due to that premise, this book is frequently compared closely with, and questioned whether it influenced, Michael Crichton. For the most part, I think it's really only the science that the two really share in common. For the first half of the book I barely felt anything happened remotely close to JP. And then. The science comes into play, and ideas of how to clone a dinosaur from long dormant cells mixed with DNA from modern day animals felt very on target. Yet, there are details about the dinosaurs, the scientific belief that they are the ancestors to modern birds, which wasn't all that commonly known in the mid-80s, but years later accepted pretty much as fact, as well as some other depictors and facts about the dinosaurs that even Crichton didn't include in his first novel. Had I not known this book was written first, I would have believed it ripped of JP, but instead had ahead of its time accurate information about dinosaurs that took years to become known in the mainstream.
For the rest of the plot, it's not really that similar. JP had a greedy old man (kindly one in the movie) utilize modern biological techniques to being dinosaurs back in hopes of profiting off them as an attraction. In Carnosaur, a wealthy British Lord who has a penchant for big game animals and has an extensive zoo on his grounds brings dinosaurs back for his own purposes, not for the public to gawk at. The chaos that follows when the creatures finally break loose is more akin to the Jurassic World movies that the original JP books or movies.
I'm not sure Crichton did get his ideas from this book, especially since it was anything but a blockbuster like JP was. I think two authors at some point in the 1980s read about cloning advances and new dinosaur discoveries and had slightly similar yet still very much different ideas.
Carnosaur was an action-pack, gruesome ride, which unfortunately suffered the awkward sex scenes prevalent in 80s horror books of this type, but overall was quite entertaining.