Photoshop :: Creating A Brick Texture

My house is a red brick house that has had a white wash applied to the brick. (Those that don't know, this is like very thin white paint, or stain for brick. It gives a white look to it.) Anyway, I'm considering getting rid of the white wash (by use of pressure wahser) and would like to see what it will look like with the fresh red brick look.

I have a shot of the existing house (posted below) and a shot of the area where the white wash was removed. I now want to apply this "clean brick" to the "washed brick" to view the entire house.

Due to the brick not having a consistent color or texture, changing this in PhotoShop has become difficult. My only thought is to create a new texture or brush based off of a portion of the new brick. Then to select and apply that to all of the old bricks. Obvioulsy selecting all of the old bricks is another problem of its own.

The file upload manager seems to not be working for this forum. I'll try to upload later. For time being, imagine replacing a painted brick with a plain brick.