The Yellow and Green (also called Citrine) Lorikeet (Trichoglossus flavoviridus flavoviridus) is from Indonesia's Sula Islands.
Meyer's Lorikeets (Trichoglossus flavoviridus meyeri) are a subspecies of the Yellow and Green/Citrine Lorikeet above. They are from Sulawesi, Indonesia.
They are smaller with darker green backs/wings than the nominate Citrine Lorikeet and have light lime green scales on their front rather than yellow, with olive heads.
The Scaly-breasted Lorikeet (Trichoglossus chlorolepidotus), also called the Green and Yellow Lorikeet, is from eastern Australia.
In addition to the scaly effect of its green-edged yellow feathers on its front (less scaly than the Meyer's Lorikeet above), it has a blue-green crown.
One of the mutations in aviculture is a khaki variant called
the Grey-green Scaly-breasted Lorikeet.