[iron-clover]

I also like Dumerials Boas, I quite like their patterning that acts really well as camouflage, the fact that that they're fairly simple to care for (not much different to common Boas and that they are a little bit different.

As Gazza says, make sure if you do get one them make sure its microchipped and has the paperwork.
But really, I agree with CloudForest that if you've become "bored" with your Royal, how do you know that you won't get bored with the Dumerials? At the end of the day they are both heavily bodied snakes and they're not going to be all that much different.
Except the Dumerials can live for 40+ years, which is a loooong time in which to become bored again.

For the sake of the snake, give it some really deep thought before buying one- will you be prepared to keep it for 40 years from now come thick or thin? If so, then great, but if not then the responsible thing to do would be to avoid.
Snakes are not disposable to the whim of their owners- you may struggle to offload your Royal as it is, and no one really can tell if you'd be able to find a new home for a Dumerials in 10 years time- anything could happen in the hobby in that time.