Juvenile Blue cheeked rosella query

[(Stephen Mugford)]

I am familiar with the juvenile Crimson Rosella, with its green form slowly
moving through the patchy version until it becomes the adult, smooth
crimson.

Does the Yellow version have similar transformation? I ask because near
Wagga I saw a flock of mixed rosellas --Eastern and Yellow, which included
a couple of blue cheeked rosellas with a peculiar, mottled 'blood orange'
plumage all across the breast. It looked like the field guide illustration
of the Adelaide rosella (never seen one), but surely it could not be that
-- it was about 1000 km out of range!! I assumed juvenile Yellows. Is that
right?

Stephen Mugford