Outwardly very similar to dc3 except the 'Hiper' label at the front ( in old Avianca livery, of course ).
Avianca was probably the only Hiper operator that I know of in Colombia, the bulk of the DC3/ C47 you mention are stock types and came later.
No idea if the Hiper was a factory item; most likely a modification with Douglas' approval. (Read somewhere that a Hiper was used by a Middle Eastern outfit at some point - likely only very few of them existed)
