As long as the product of the mass and velocity of one balls are same, the balls will have the same momentum.
Momentum:
It is product of the mass and the velocity of an object.
p = mv
Where,
p - momentum
m - mass
v - velocity
Thus, the momentum balls will same if the ball with less mass has a higher velocity, and vice versa.
Therefore, as long as the product of the mass and velocity of one balls are same, the balls will have the same momentum.
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