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There is a setting for the karma restore after canceling a downvote, but interestingly enough it's not the opposite of the karma loss by default:

Gain for voter on canceling downvote | Default value: 1

Administrators on the site just changed the settings to mimic SE as much as possible, though there's no separate setting for downvoting an answer vs a question:

Loss for giving a downvote: -1 
Gain for voter on canceling downvote: 1 
Loss for owner of post that was downvoted: -2 
Gain for post owner on canceled downvote: 2