Diamonds just need it to be cooler than the other python species as they are more tropic than the scrubby tropics that other Morelia are found in. IJ sibs pretty much don't sell unless people lie about the genetics. I'll be producing 87.5% IJ jags that are 100%het granite and even these siblings at 87.5%IJ being fully het granite just won't see easily but the 50% jags will. Very easily. Which will make up for it in the long run of things.
As nick said species to species makes it a hybrid. Can have sweet offspring but they will be very hard to produce as living hatchlings. And then those can't be sold for anything other that a designer pet which may or may not have a market.
Some of the best advice giving me when I got Into working with Morelia is simply breed what you love. Not what the market loves. There are plenty of breeders for the basics. Some for the good morphs but it means nothing if you're not breeding what you want to breed into. One of my next big Morelia investments is going to be a pair of zebra jungle carpets So I can produce those super sweet patternless super zebra. But again it's because that's what I enjoy and want to raise up.
If bredl are your cup of tea dive in and breed them! Just don't make morelia choices based on what could make you money Because at current the market is quite shaky.