It's an interesting idea (and my two favourite snake species as well!). My guess is you wouldn't get any offspring at all, let alone viable ones. These two are from different genera (Liasis and Python), so are probably too different. The "superball" hybrid of the P. curtus and P. regius is viable (remarkably!), but Roussis for example produced only 1 successful clutch out of 4 attempts.

The hybrid discussion is an interesting one, and I for one would like to see it intelligently discussed without any flaming!