Boletus or Xerocomellus?
As you will see in the Species section of the Wikipedia Xerocomellus genus page you linked, Xerocomellus chrysenteron has a basionym (original name) of Boletus chrysenteron.  The Xerocomellus genus was first described in 2008.  The Wikipedia page for the X. chrysenteron species similarly gives three synonyms for X. chrysenteron in the box at the top; among them is Boletus chrysenteron Bull. (1789).  Thus the two names are referring to the same mushroom species.

One should note that Wikipedia says about this species:


  Macroscopic observation of Xerocomellus chrysenteron is not sufficient
  to determine this species with certainty, as many intermediate forms
  occur between it and other taxa


It appears from this that correct identification of a mushroom as being X. chrysenteron is not a trivial task.