190 vs 197?

[rodltg2]

I always thought that these two boats were exactly the same, just different top deck. The reason I ask is because I noticed that on the 2013 Approved Tow boats test, MC had both the 190 and 197 tested. Nautique on the other hand only tested the closed bow 200. So I am wondering if the 200/200OB are excatly the same and do not need to test individually, or the 200OB is not approved?