I do not have an older child. FWIW, though, my DD8 thought the grade-level "reading" ITBS was "easy" compared to the MAP "reading" exam. The big difference, from what I understand, is that the MAP test is computer adaptive and it appears that she answered questions on MAP that may have been "above grade level," as compared with ITBS. So her perception was that MAP can get more difficult than ITBS. When your child answers a certain # of questions correctly on MAP, the questions "adapt" and can get more difficult (or easier if answered wrong). She scored 99% national percentile on both, but was able to hit a pretty high RIT score on MAP (higher RIT than she needed to get 99% in her grade, so this probably explains her perception of the test).
