I think they are about the same. I think the questions on the NLN were more of an overall of subjects, instead of specific. I mean, there were specific questions, but they covered a lot of subject areas. I didn't find there were 10 on heart functions, etc. The science actually covered a lot of NON-health related stuff. I've mentioned before that I had a few questions on electricity - OHM's and that sort of thing.
Be sure to get math functions down, adding and subtracting fractions, etc., WITHOUT the use of a calculator. That was what threw me. I had just finished a math class, which I got an A in, so I didn't study much at all, just brushed up on dosage calculations. What I forgot to do was do them without the calculator - just pen and paper. I used up all the time in that section, and still didn't finish all of the questions. If I had to do it over again, that would be the biggie for me.
Good luck to you! Let us know how it goes!