Will a 16v 1000Ma power supply work with a 9v 850Ma power supply for an electronic keyboard?

I have a keyboard that requires a 9v 850 Ma . I do not have one except for a 16v 1000 Ma from another . Will this work? I thought you can’t go lower, but you can go higher in power? Please help.

The 16 supply will damage your keyboard. The voltage must be the same. The mA can be the same or more but the voltage must be the same.

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