I am assuming that you are thinking of breeding boa constrictor pastels ?
This cross breeding is possible and can produce some stunning animals, However you do need to think about the ethics of mixed breeding. Opinions vary on this issue with some saying that bloodlines should be kept as pure as possible and others thinking that a more attractive animal is more valuable to the pet keeping hobby.
If you are not set on breeding , I have found that these two phases can be housed together with no problems .

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