questions on 'arc diff'

[Jack]

Hello,

I've got some updates to the KMyMoney handbook I'd like to submit for  
Phabricator review.  However, I committed them locally to a different  
branch (docs) than where they belong (5.0).  I've merged 5.0 into my  
local branch, which included commits since I created that local  
branch.  Will "arc diff 5.0" do what I want/what is needed, or is there  
a better way?

Thanks.

Jack