According to wikipedia they are different varieties of the same plant (lens culinaria). Red lentils are brown (masoor) lentils with their husks removed, so they will cook faster than green lentils.
Brown Lentils are like a type of soup. They look like flat peas, and can probably be found near the dry pasta area in a store.
Thuvaram Paruppu
Honey is a good alternative.
yes