Most bredli will be bigger than most irian jaya's. Of course most males stay smaller than females, so if size is ever an issue I would try getting a male. Though if you're willing to take on a BCI then a bredli wouldn't be an issue I don't think.
Differences in husbandry are quite subtle. There is always a basic that works for most snakes and that is 90 hotspot and 80 coolside/ambient. Only major difference would be humidity I think. Boas will need higher humidity not just for shedding but higher ambient as well. A carpet will do fine in pretty much whatever humidity and will shed pretty much no problem. A boa has a much thinner skin and therefore needs higher humidity.
Cage size may be a little different, but generally the same. A large boa would like to have a 6'x2' floor space, but then so would a large bredli or Irian jaya. However carpets are often considered semi arboreal and therefore will use height in a cage as well. But usually both will be fine in a 4'x2'.
Now, I might be the only one. But I think even a boa would use cage height if you gave it to them. Most snakes are adept climbers, even if they are terrestrial. I'm not saying you have to, but it's an idea. I just don't want you to think a boa wouldn't use it, so if you want to then go for it. If not I haven't seen many boa's complain about having short cages lol. It's all up to you, you see that you can't really lose with either! Hahaha snakes are awesome eh'? ~Caylan.S.~
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