I am using the TinkerKit Relay Module and recently they changed the relay mounted on the board from a white one with 10A250V~ to a black one with 10A125V~.
In my country the voltage is 220V~. Can I use the black relay in my application, safely? May be there problems that I have to be careful?
The part is obsolete now according to Mouser. The simple answer is no, you cannot use a 120 volt part at 220 volts. The higher voltage can breakdown the lower voltage rated parts. It really has nothing to do with the "power" rating as there will be very little power actually dissipated in the relay. The current handling of the contacts is one issue and that seemingly didn't change but the voltage rating change is basically saying that this part cannot work at 220volts.
