They are of the same shape and same dimensions. Other than that everything is different. They are made of different materials, have different mass, density, specific gravity, coefficient of friction, thermal conductivity, porosity, etc, etc. You name it and they are different.
volume
When their denominators are the same or different numbers.
similar to look the same but have a different size or measurement.
Then they are similar.
similar, same, indifferent,
no; they have the same volume but their mass is quite different; density is mass/volume and the sponge has much lower density
volume
A brick weighs more than a sponge because its material, such as clay or concrete, is denser and more compact than the material of a sponge, which is porous and lightweight. The density of the brick's material causes it to have more mass packed into the same volume compared to the sponge.
Because they both absorb in the same way
Hexactinellida, Calcarea, Demospongiae, andSclerospongiaeTechnically, however, the Sclerospongiae are not considered sponges. They are very similar, but they are not the same. Like bats and birds who have both evolved the ability to fly but are not the same types of animals, Slerospongiae have evolved and became very similar to sponges, but they are not sponges.
sometimes
The acceleration due to gravity is the same for both objects because it depends only on the mass of the Earth and the distance from its center. While the brick has a greater mass, the force of gravity acting on it is also greater to account for this, resulting in the same acceleration for both objects.
When their denominators are the same or different numbers.
same, alike, similar
A brick made of lead would weigh more than a brick made of iron of the same size. This is because lead is denser than iron, meaning it has more mass packed into a similar volume.
similar to look the same but have a different size or measurement.
similar strongly suggestive of virtually (not literally) the same