Name of cognitive bias that causes experts to overestimate their ability in other areas? Is there a name for a cognitive bias that causes people who have been successful in one area to be overconfident in their level of knowledge / ability in another unrelated area?

It's related to the Dunning-Kruger effect, but I'm specifically referring to the case where the overconfidence comes as a result of having been successful, and feeling as if that success makes the person qualified to have strong opinions on all matters, even when at odds with experts in that field.
The Dunning-Kruger effect is specific to expertise in a particular domain. The domains tested in the original studies by Kruger &amp; Dunning (1999) are: humor, logical reasoning, and English grammar.

It is fully possible to underestimate your skills in one domain in which you are an expert, and overestimate your skill in another in which you are a novice. As per an interview with Dunning, published at Vox.com:


  But there are a couple things that people get wrong that are major.
  
  The first is they think it’s about them [i.e., others]. That is, there are those people out there who are stupid and don’t realize they are stupid.
  
  Now, those people may exist, and the work isn’t about that. It’s about the fact that this is a phenomenon that visits all of us sooner or later. Some of us are a little more flamboyant about it. Some of us aren’t. But not knowing the scope of your own ignorance is part of the human condition. The problem with it is we see it in other people, and we don’t see it in ourselves.
  
  The first rule of the Dunning-Kruger club is you don’t know you’re a member of the Dunning-Kruger club. People miss that.


Your description also seems related to a logical fallacy, namely appeal to unqualified authority, or appeal to false authority, typically categorized simply under appeal to authority:


  However, appealing to authority as a reason to believe something is fallacious whenever the authority appealed to is not really an authority in this particular subject, when the authority cannot be trusted to tell the truth, when authorities disagree on this subject (except for the occasional lone wolf), when the reasoner misquotes the authority, and so forth.



Kruger, J., &amp; Dunning, D. (1999). Unskilled and unaware of it: how difficulties in recognizing one's own incompetence lead to inflated self-assessments. Journal of personality and social psychology, 77(6), 1121.