Xiaomi Redmik40 is not able to use k50's 120-watt charger for fast charging, but k50's 120-watt charger can be adapted downward, Xiaomi Redmik40, he only supports 30 watts of fast charging, if your power adapter also supports 30 watts of fast charging, Then he can charge Xiaomi's Redmik40, if your charger also does not support 30 watts, then she will be adapted downward, charging power will be lower
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It should be OK, check the support current and voltage of the charging head before use. The charging power of the K50PRO can support up to 120W charging power, and the charging power of the K40 is only 33W.
The current charger can change the charging current and voltage according to the rated power of the charged device, so in general, high-power chargers support more combinations of charging voltage and current, and are generally backward compatible.