Can you stain it yes, will it ever match, no way.
It will also come out blotchy and some will end up on the morter.
My guess is that was some left over brick he had laying around, very poor workmanship to do something like that. I would have ran him off and got someone else to do the job if that''s the kind of work he does.
Last edited by joecaption; 11-23-2011 at 08:29 AM.