What changes between B1 and B2
The published item count goes up while the published duration does not, which is the clearest signal of what B2 demands: the same hour of attention spread across more decisions. Both figures are printed on this page with their source. The texts themselves carry more implication and less explicit statement, so answers stop being findable by keyword.
As at B1, Instituto Cervantes does not publish a per-task typology on the level page. The official Modelo de examen is the reference for the shapes, and this page links to it rather than describing tasks we have not verified.