Its perfectly normal to get similar/same assessment and exam marks, regardless of consistency.
If you're ranked first in subjects then there is a high probability of that happening. It also depends on how the rest of your class went in the subject and how your assessment mark was then moderated. You may have gotten an exam mark of 85, but if you were ranked 10th maybe and the highest mark was 91, depending on the spacing etc and ur class performance, ur assessment mark may have turned out to be about 85 as well. Also, the marks are rounded, so you may have gotten a 85 exam and 85.4 assessment, with both being reported as 85.
Either way, doesn't matter much now does it? It's over...