Is there a way to convert a adafruit_neopixel libary sketch to FastLED library sketch?

Or will I have to re-write the entire sketch from the ground up?

I'm specifically referring to this sketch from sparkfun: https://github.com/bartlettmic/SparkFun-RGB-LED-Music-Sound-Visualizer-Arduino-Code/blob/master/Visualizer_Program/Visualizer_Program.ino
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