Answer:
1:1
Step-by-step explanation:
If weight is same on Earth's surface, it means their masses are also same, but as densities are different, hence their volumes will also be different.
But in vacuum, if it is free from gravity, there will be no weight, but if gravity is there, still as the masses are same, no matter densities are different, weights will be same means ratio of weights will be 1:1.
Therefore the weight ratio in the vacuum will be 1:1.