From mboxrd@z Thu Jan  1 00:00:00 1970
From: Phil Susi <psusi@ubuntu.com>
Subject: Re: Compare two diffs on the command line?
Date: Fri, 4 Sep 2015 15:23:40 -0400
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To: Junio C Hamano <gitster@pobox.com>
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On 9/4/2015 2:10 PM, Junio C Hamano wrote:
> On Fri, Sep 4, 2015 at 11:00 AM, Phil Susi <psusi@ubuntu.com> wrote:
>> If you have a commit that exists on two branches, in gitk you can mark one,
>> then select the other and choose to compare the two.  This results in a diff
>> of the two diffs, rather than a diff between the two trees, which include
>> many other changes that have nothing to do with either commit.
>
> I think you are looking for the interdiff(1) tool.

Yes, that is how I would do it before git... I was thinking there would 
be a git way of doing it, especially since it is there in gitk.