When in Wonders,, if you make a trade in city's between players that a wonder is on within your own alliance,, is there any break up or any interrupted progress with the Wonder?
On the en. servers the answer would be no, there's only a break if you lose the city to an enemy or it ghosts (and then you have to restart the present lvl or lvl 9 if the wonder has been completed). I'd assume it will be the same here