Did the diffusion distance differ between the cubes

No, the diffusion distance does not differ between the cubes.

Explanation:

Diffusion is the process by which materials get transported from higher concentration to lower concentration. How much ever the cube size is the rate of diffusion remains the same. Depending on the size the diffusion will not happen at once. The more the volume and lesser the surface area diffusion take a longer time.

To transport the materials through the cells through diffusion takes longer time and hence higher organisms have specified organs to help them in this diffusion.

there’s no image attached but i can if you want: )