Density.
Objects of the same size can weigh differently due to variations in their density. Density is a measure of how much mass is in a given volume, so objects with different densities will weigh different amounts even if they have the same size. Additionally, the material composition and structure of the objects can also affect their weight.
Actually they don't. They're lighter.
Two objects may be affected differently by the same strength force due to differences in their mass, shape, and material composition. These factors can influence how the force is distributed and how the objects respond to it, resulting in varying effects on each object.
Two objects with the same mass would have the same amount of matter, meaning they would weigh the same when measured.
The difference in the gravity of the two planets
In a vacuum, solid and hollow objects fall at the same speed due to gravity. However, in the presence of air resistance, hollow objects might fall more slowly compared to solid objects of the same mass and shape, as air resistance affects hollow objects differently.
It depends on what you are measuring, as different materials of the same volume weigh differently.
Objects under water seem to weigh less but they have the same mass as they would out of water.
Dynamic polymorphism is a programming method that makes objects with the same name behave differently in different situations. This type of programming is used to allow Java Scripts to run while playing a game on the computer, for example.
Objects that weigh less exert less downward force due to gravity compared to objects that weigh more. Gravity acts on all objects equally, causing them to fall at the same rate regardless of weight. However, weight is a measure of the force of gravity acting on an object's mass, so objects with more mass will have a greater weight and exert a greater force on a surface when supported.
Objects with the same charge repel each other, causing them to push away from each other. Objects with opposite charges attract each other, resulting in them being pulled together. This behavior is due to the interaction of electric fields surrounding the charged objects.
If I understood your question right, then any two or more objects will weigh the same if they contain equal amount of the same substance.