A rating is required for the bowling ally/crowd killer? Seriously? Wow. Are you sure it's not simply a company 'check-out'? Anyhow, other than some size, door configuration, they are basically the same. That being said, the 206 is a much more capable and forgiving a/c than the 207. I have been told that you can actually load the 207 so that the tail sits on the ground and you are still within c of g. Not something that we ever did as you will end up with a negatively stable aircraft. Heavy stuff in the front, light stuff in the rear. The 206 that we flew had a stol kit (Robertson i think) of sorts on it, and would get airborne before the asi moved. Great a/c. Two 207's; one turbo, one not. Both good, but the non turbo nobody seemed to like to land... too much spring or something in the gear. (sorry for the non-tech term, i'm no AME.)
Anyhow, back to the original request... I guess it all depends where you will be flying it. (Bots?). Back home (canada) I do seem to recall that we did a company check out in one each year and it would be valid for the other one.
And the flapless landing thing.. probably not a great idea on a loaded 207 unless you have a flap failure; almost sure to make the 207 a tail dragger, but without the req'd tail wheel!!
Have fun, and don't forget to double check the formerly mentioned doors on the 206 and 207. The nose door on the 207 does have a tendancy to open up at around 60kts if it is not closed and locked correctly. I never had a problem with the rear doors; If memory serves correctly they overlap so that the slipstream will keep them closed. None the less, good to double check them before you go.