These shrimp have previously been classified as Neocaridina heteropoda and Neocaridina denticulata sinensis, and some out of date printed material may reflect that, however are now properly known as Neocaridina davidi.
Rilis are just a variation of color. They are no harder or easier to keep than any other Neocaridina.
Red rilis come from red cherries. Orange rilis from orange cherries, etc`