all 3 are the same damn thing.
you are taking exact comparisons and using unnecessary technical terminology to differentiate them.
if you want to explain the differences, you picked possibly the worse content for making your point.
if the 3 games didnt have these BUILDING BLOCKS, then they never would even have heard of each other. yet here the discussions go on...
so clearly they are the same in that aspect.
Except, in your example, all three are different.
Blockland uses bricks; predetermined-sized building resources with discernible differences in shape.
Roblox uses blocks; assorted, similarly shaped and scaled building resources.
Minecraft uses Voxels, volumetric pixels, that simulate a survival world.
All three have different uses, different forms, different characteristics, and therefore different names. These are related to real world/already made objects - (Lego) bricks, assorted shaped and colored plastic resources for building; (building) blocks, usually square, triangular, or conical wooden prisms used to create small buildings by young children; and the Voxel (volumetric Pixel/Volumetric Picture Element) which was originally used to create 3D images similar to the way televisions and computers display images in 2D.