I am pretty sure they have had columbian x suriname crosses, but they're not very common. I think they're pretty hard to breed because they are both really different sub species - Boa Constrictor Imperator (Colombian boa constrictor)... Boa Constrictor Constrictor (Suriname Red Tail Boa) in this case. You might want to try talking to some Boa breeders that specialize in these species, and do a little research on it. Hope this helps a little!
Who are you callin' a freak?!