Their picture for 'Dwarf Cavendish' is from the banana wiki page for 'High Color Mini'.
Oasis's 'Dwarf Cavendish':
DWARF CAVENDISH BANANA PLANT - 2 SIZES AND SAME PRICE MULTIPLE PLANT DEALS AVAILABLE
wiki page for 'High Color Mini' (pic attributed to Flying Dutchman):
Musa High Color Mini - Bananas Wiki
EDIT: just noticed that Oasis has removed Flying Dutchman's pic (currently 8/25, don't know when they replaced it)