Falguni I have both flore plena from logees and mysore mulli. What I can tell you is that any differences between both is very subtle. The flower stalk of flore plena is shorter and stockier. Mysore mulli is thinner and longer. Flore plena's buds are rounder than mysore mulli's. Both the blooms are multi layered and flore plena has atleast 3 layers. My mysore mulli is a 2 yr old plant and flore plena got it this spring but it does bloom profusely and is a fast grower. Flore plena's blooms are at this point a little smaller than mysore mulli but it could be the age factor. Fragrance wise maybe very little difference. To be honest I have all sambacs available online and expect for very minor notes here and there, they are all the same. Here's the plant and the bloom of flore plena.

I have mali pikul as well. Its called as mali todd too. Wonderful flower but it is very a small bloom compared to other sambacs. The shape of this bloom is almost like a lotus. This plant I have noticed performs well once its ages. I have a year old plant. Here are the plant and the blooms. I have posted this bloom previously too maybe a better flower. Just search for it.

As far as Mali chantaboon is concerned I think it is a thai name for grand duke supreme. But I could be mistaken.