There's differences. Honolulu requires fire safety course and has a defined shooting test. Mauis test has to be equal or harder than the NRA CCW, Big Island instructor verification process is very simple, Big Island has a sensitive places law with some small differences, etc.
There are differences on the mainland. Some counties allow open carry while others do not, sheriffs apply stricter standards for approval, NYC has harder requirements than the rest of the state, etc.
Differences are small, but stating the county ensures you get the best information.