A Good Twist Would Have Been.....
if the kids weren't clones but orphans or rather unwanted children.
Society had progressed through medical technology and could do organ transplants but not enough donors. So the Government pretended it could "clone" or make copies of existing humans to provide organs for it's voters.
Basically most societies create an underclass i.e. since early so-called civilisation people, even children, have been enslaved and worked to death. If organ transplants had existed in Egyptian or Roman times I'm sure they'd have sacrificed their slaves in a heartbeat (pardon the pun).
So the author's social commentary is that we may have progressed in terms of technology, but we haven't evolved to the point where we see everyone - no matter who they are - as equals.
These "clones" are our equals and how anyone could doubt it is puzzling.
Anyway I'm sure the author meant that these character are indeed clones but society as a whole are happy to enslave them.
I just think a good twist is that the characters find out that cloning is not yet possible.
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I'm not posh, I just like VB's clothes.