Also, almost all enlargers use the Leica M39 thread.
Thing is, back in ye ole daze, it used to be common for companies to suggest using the same lens for printing.
They used to say "Would you let your photos be printed with a lens of a lesser quality than the fine lens you used to take the picture?"
In reality, there is a difference. Enlarger lenses are optimized for flat field reproduction while camera lenses are not.