IOS 11 and changes in physic simulation

Is it possible that with the new ios 11 something has changed on the physic simulation side of spritekit?

i am developing a pool game and before ugrading one of the test devices i had no problem with the coordination of the physic simulation on different devices (all with 10.3.x) now instead something has changed and there are huge differences between the simulation on the ios 11 device and the ios 10.3.x devices.

To better explain:

i have a ball, the position is the same, i send a msg trough tcp with the direction of the impulse, the other device receive the msg and apply the impulse on the ball.

in the 10.3.x version both the simulation were the same, even on different kind of devices (5-5s-6-6s), now the ios 11 devices differs in the simulation in a very evident way

someone has experienced the same situation?