The Intel Core i5-14600KF has been benchmarked on Geekbench. It scores 2,794 and 17,190 points in the single and multi core tests, respectively, making it up to 16% faster than the Core i5-13600KF. https://www.notebookcheck.net/Intel-Core-i5-14600KF-shows-up-on-Geekbench-with-decent-performance-gains-over-the-Core-i5-13600KF.739799.0.html
Those gains are better than expected and well beyond what clock speed bumps would deliver. They must have done some other changes to the cores.