Why is it different between two commands and i am not able to open second one?

Untitled voronoi%20skeleton%20(2)DFGN

The one on left is called Explode. It explodes a curve (input C) into smaller segments.
The other one is called Deconstruct Brep nowadays. In a past Grasshopper version, it might have been called Explode (?) and renamed later. Either-way, it deconstructs / explodes a Brep (input B) into its constituent parts.