hi croco,
i took the Kaplan course and i thougth that the qr portion of the Kaplan was very hard. some practice test were very easy while others were way too difficult.
when i took the DAT, i think that it was way easier than what the Kaplan course wants you to learn. i don't think that you should see it as comprable to kaplan or not, as you never know what you will get.
i suggest you learn as much as you can from any source. you may get a really easy qr, but a difficult PAT or vice versa.
good luck!