Not all agree, but in my opinion.. No. Much less priming sugar for kegs, or it will be too foamy.
My plan, 2 tablespoons sugar for 2 mini kegs, then half of the normal 5gal sugar, or about 2.5 oz for the remaining 2.5 gallons.
In your case.
1 gallon keg = 1 tbsp sugar
1 gallon bottles =1 oz sugar
A tbsp is 1/2 ounce, so you use approx half the sugar to keg as you do to bottle.