Those pics look pretty good. Wish I could take good pics.

First and Second gen Odys where body coded as RA's last one was I think was the RA6. RB1 is refering to the model codes for the 3rd gen Ody, for yours it is the 4 gen and instead of changing the body code to another alphabet and number range they decided to carry on and call it the RB3. There is a RB2 that is a JDM model with similar shape to the RB1 but with 4WD. RB4 is the 4WD version of your RB3. The letters signify the shape, the numbers to differentiate between engine and other mechanical differences.

Other Honda models have got their own codes, FD1, FD2 refering to the current civic range etc, you get the idea. I just like to use the codes cos it makes me look like as if I know what I am talking about hahahahaha.