I'll be honest, with the exception of Bozie and Spike (duh), I have no clue how to tell the other three apart. I'm also only like 71.92% sure I got Bozie right.
In this picture, you have Bozie on the Left and Maharani on the Right. When trying to tell the Calgary girls apart, one of the easiest characteristics I like to look at is the ears Kamala is missing part of her left ear, and Swarna's ears are filled with tons of pink, much more than you can see here on Rani's. Swarna is also very petite when compared to the other girls. I'll upload some pictures of them to the gallery later.
Bozie is wider than others, Swarna is smaller, Kamala is similar to Swarna but lacks part of her ear and moves a little harder due to arthritis and Maharani is tall, slender and has long legs.
@Elephantelephant Bozie might not be wider than others for much longer. She has been losing quite a bit a weight recently. When I got back and look at older pictures I have of her the weight loss is pretty significant.