The original creamsicles were spawned from albino corn snake x normal great plains rat and then breeding the offspring back to each other or back to the albino corn parent.
Back then, GP rats were a subspecies of corn, thus making the pairing an intergrade. Taxonomic work was done some years ago on the emoryi complex, resulting in the elevation of emoryi to full species and listing of subspecies within it. This elevation now renders the cross a hybrid. More recent work, according to some, has sunk those subspecies (meahlmorum and intermontana). The albino gene from GP rats didn't play into the production of creamsicle corn until the first naturally occuring albino GP rat snake was found in the wilds of Kansas in the mid-90s and brought forward to the hobby by Don Soderberg.
Genetically speaking of the original crossing, a creamsicle is an albino corn x great plains rat hybrid. Percentage wise, the originally produced creamsicles would either be approximately and very roughly 50% corn snake and 50% great plains rat snake (i.e., any albino offspring from breeding the F1 brothers and sister back to each other ) or 75% corn and 25% GP rat (i.e., any albino offspring that result from pairing the F1 back to the albino corn).
Typically and hypothetically speaking, your more orange colored creamsicle corns should be around 50/50 corn to GP rat or lean a little heavier on the GP rat influence.