As you probably know from reading posts here on SDN, Topscore is more detailed than the actual DAT. I took mine late July. My science was mostly conceptual.
For example, in biology i didn't have any questions from respiration (crazy!!!), endocrinology, classification just to name a few..
With gen chem, i had about 2-3 calculations. Two of the calcuations were already laid out, so i actually had one real calculation problem.
PAT, i would say about the same if not a bit harder.
Reading, i don't know. People here have been saying that it has a lot of tone questions, but mine was mostly fidning details just like topscore. Maybe a few tone questions each paragraph which weren't bad. Tone questions didn't ask for tone of the whole passage, just selected paragraphs..
Quantitative Reasoning, i don't know.. I kinda bombed this section due to lack of practice and crazy timing. Make sure to practice a lot on word problemes in a timely manner. I think everybody can do well on the math if we weren't under time pressure, but what can you do..
Good luck