No such requirement. The jumpers merely must be in their own halves of the circle, but don't even need to face any particular direction.
6-3-1 . . .
For any jump ball, each jumper shall have both feet within that half
of the center restraining circle which is farther from his/her basket.
NOTE (following article 8)
NOTE:
During a jump ball, a jumper is not required to face his/her own basket, provided
he/she is in the proper half of the center restraining circle. The jumper is also not required
to jump and attempt to touch the tossed ball. However, if neither jumper touches the ball
it should be tossed again with both jumpers being ordered to jump and try to touch the
ball.