GGG, Could we get further clarification on how recombination will work in 3.25 compared to 3.18?

In both showcases we have seen, the base types were the same. This is rather different compared to the past. For example in 3.18 you only needed two items of the same class, which allowed normally impossible modifier combinations such as getting spell block on a pure strength shield basetype.

Does recombination still work the same way? Or are we now restricted to only the same base types like the showcase might suggest?