Difference between Fire Bellied Newts

[Thraxace]

I have a couple of fire belly newts. Ok, after researching online, I'm still not very clear about the difference between fire-bellied newts, particularly, Cynops orientalis and Cynops pyrrhogaster. I bought them from the same shop and the same tank. I know that Cynops orientalis are supposed to have rounded tail ends but one of my newts has a sharp tail while the other has a very rounded tail. Although both newts are the same size, same colour, and same smoothness, the tail difference is very obvious. Some help please?

Best regards,
Thraxace.