They don't. Balls are standard size for both games; the only difference is men's tennis balls are slightly tougher - extra duty rather than regular duty. Though I think at Wimbledon men and women use the same.
I wanted the ‘no’ option @LX.
That's cricket not tennis
I thought this was the Peaky Blinders thread.
I didn't know women had balls.
They do, but they're lighter than men's.