Note that I placed my ID in quotation marks. You don't know the lineage or the geographic origin, so all anybody can do in the case of any Antaresia without any history is give you their best guess.
My best guess is also placed in quotation marks because of the history of those animals. So far as I know, the only lineage of A. childreni in the US dates back to three pairs imported by Hank Molt back in the early 1970s. One pair went to Dick Goergen in NY, one to the Houston Zoo, and the other to Steve Segal in Florida. Of course, back then all four species today recognized in the genus Antaresia were identified as "Liasis childreni." These particular three pairs of animals were bred as "red-desert-phase Children's pythons" in order to distinguish them from the spotted pythons that were common in captivity. That was Goergen's name for them anyway, but they are not red and not from a desert.
I happen to know the man in Australia who sent the snakes to Molt those 30 years ago and I was told that all six of those animals came from the general vicinity of Mt Isa Queensland in what is today recognized as an area of intergradation between typical stimsoni and childreni. So I place "quotation marks" around my identification of the snakes as childreni, because they do not look like Northern Territory textbook.
All of this is further complicated by the fact that when "stimsoni" started being recognized by US keepers in the mid-1990s, snakes from this lineage, purchased from VPI and other breeders for $25-$75 dollars were repackaged and sold to unsuspecting collectors as "stimsoni" for $1000 each and more. So, many of the snakes in this lineage are probably breeding with the Alice Springs stimsoni that came into the country at that time.
Your snakes in those photos look identical to the pure strain of snakes descended from those original NW Queensland animals. I have kept snakes in that lineage from 1978 to the present. Tracy and I hatched over 1000 of them in the 1990s, so we've seen a few. Our original animals include Goergens breeders and Segal's breeders.
Are they really "childreni"? I don't know--who cares? They are the closest thing to "childreni" that have ever been in US collections that I have seen and of which I am aware. Unless in very recent years some actual nothern Australian A. childreni have been smuggled in (and I've not heard even a rumor of that happening--why bother?) this lineage is the only "childreni" that we US keepers have ever had. These animals do have a fading of the pattern that comes with age, a childreni trait, and we are very comfortable refering to them as childreni.
They do readily cross with spotted pythons, and over a 30 year period they have been crossed with spotteds to make a variety of appearances. Interestingly, the hybrid crosses do seem to have reduced fertility--so anyone who has odd-looking "childreni" or "maculosa" that don't seen to lay very many fertile eggs, maybe those are some of the hybrids that are around.
Those are nice animals you have, very good looking. They are superb little pythons for people to be breeding. They are about as hardy as pythons get, they are easy breeding, and most of the babies hatched today will feed on pinks.