What does white lightweight and white new dense version means?

When the T1 was released, the white is a normal density foam but lighter, gray is a high dense foam but 50gram heavier.

Everyone bought the gray version, which means the high dense foam is more popular.

So in the listing of T1 Fuselage spare part, 

Grey - means the high dense foam version

White lightweight - means the white light weight version

White new dense - means white but high dense form version

The T1 fuselage ? here