Not an easy job without it showing. I've used brick dust mixed with cement to repair a dimpled brick which can't be matched and worked a treat. Some you HAVE to cut out.
Try cutting back the corner more of the damaged brick. Get a match or near match brick cut the face corner off [patterned brick] and glue it in place with unibond glue which dries clear.
Of course it will show until it tones down or cut the damaged brick out if you don't like seeing the repaired corner.
Use an angle grinder and thick stone wheel to cut the mortar joint but cover the furnature first as it kicks out one hell of a dust cloud. Don't forget the eye shields either.
Bob.
Bob
December 2005