Of course not -- that would mean a whole twelfth of the population destined for another whole twelfth and that hardly sounds like destiny.
Are they compatible? Yes. Both are water signs, so there is a lot to build on, but the Sun sign is only one element in the birth-chart of a person and you should never base a judgment on just this one element. Look at the whole horoscope and see how things compare.
The best sign for Pisces is Cancer, Aquarius, Scorpio, and/or Virgo
Generally speaking Cancer-Scorpio relationships are harmonious.
In Western astrology, the water signs are Cancer, Pisces, and Scorpio. These signs relate to the creatures of crab, fish and scorpion, and are emotional signs.
Cancer or Scorpio
Scorpio
Scorpio is a water sign and would have the best connection with a Pisces or Cancer.
Scorpio
cancer and Scorpio
Scorpio or Pisces
Cancer or Scorpio
Pisces, Scorpio, and Cancer are all compatible with Cancer.
They get along MOST of the time.