Is The key to -ing followed by to or -ing?
The key to winning is to practice/practicing
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Both forms are possible.
If you check Key to success quotes then you will find examples, in which a similar phrase The key to success is... is used with both
The key to success is to focus our conscious mind on things we desire not things we fear.
The key to success is discovering this innate power and using it daily to deal with whatever challenges come our way.