What's the difference between their に and が in these sentences?

> 「私にできることがあれば何でも言ってください」

and

> 「私ができることがあれば何でも言ってください」?
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2017-08-31T12:56:33.800
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particle-に particle-が
Difference between に and が
> (1) 私 **に** できることがあれば何でも言ってください。  
>  (2) 私 **が** できることがあれば何でも言ってください。

  * Sentence (1) and (2) have nearly the same meaning, and they make sense.
  * (1) is commonly used but (2) is rarely used in the situation where offering one's help to others.
  * Compared to (1), there is a nuance in (2) that the speaker is arrogant. Conversely, (1) is very modest about the attitude of the offering help compared to (2).
  * The nuance of modesty that the sentence of (1) has depends on "に" in it. According to jisho.org, the definition of "に" in this sentence corresponds to "in the role of" of 6 written below.

> 6の意味で「私 **に** できることがあれば」を丁寧に解釈すると、 「色々な人があなたへ色々な種類の援助できると思いますが、その中で、私
> **にふさわしい役割として** できることがあれば」と言う意味になります。  
>  _If I carefully interpret the phrase "私 **に** できることがあれば" in the sense of
> "in the role of" for "に", the phrase would be like_:  
>  " _I think that various people can offer various kinds of assistance to
> you, but if there is something that could be done **as a suitable role for
> me_** ".

The difinition of に in jisho.org [here](http://jisho.org/search/%E3%81%AB):

> ### に
>
> Particle  
>  1. at (place, time); in; on; during​  
>  2. to (direction, state); toward; into  
>  3. for (purpose)​  
>  4. because of (reason); for; with  
>  5. by; from​  
>  6. **as (i.e. in the role of) ​See also として**  
>  7. per; in; for; a (e.g. "once a month")​  
>  8. and; in addition to​  
>  9. if; although​  
>  10. Ni(kana) に、二
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