Do they have blue claws on the first pair of legs ? If so, they're the Indian one. I've kept them, and never had problems with them. Not aggressive to anything else, including Snowball, Bamboo and Ghost shrimp and numerous fishes, including kuhli loaches and a few nano species too.
Also never touched any of the larger snails.. but I could not say if they preyed on the small bladder or ramshorns, but not that I saw. The only critters I ever saw them prey on were newborn Snowballs and only if they found one. The population of Snowballs grew steadily with twelve Blue claws in their tank.
I also got a couple of other machro' shrimp that came with Blue claws. They were by catch I'm sure and while almost indistinguishable when young, once grown, they were very different. They were larger, had a dark red brown shade over their backs, had noticeably larger front claws that were quite dark red/brown. Actually fairly nice looking, but not nice shrimp to have in a mixed tank.
They were much more aggressive, much more predatory, and did in a number of Snowball shrimp and possibly a Ghost or two. Very secretive, they hid almost all the time, and were unbelievably hard to catch. The Blue claws were quite outgoing and spent a lot of time out and about, and never hid like this other species did. I never did figure out precisely what they were. The stress of catching them I think killed them, of two I had, neither lived long after I managed to catch them and put them in a smaller tank by themselves.
The blue claw colour is pale, and is easiest to see if they are on a light background.. white preferably.
Edit.. from the pic, the front claws are not dark nor large.. my guess is they are the Indian species