In my experience, it's usually not possible to patch concrete without it being obvious. There are some new products that contain epoxy materials for filling in cracks, and these can often be dyed for a very close match. But, if you are talking about filling in a hole in old or new concrete, it's going to be obvious unless you cover the whole thing with an opaque coating.

Sorry if I wasn't clear--no, I did not mean a patch, I meant pouring a new porch that utilizes the same materials or methods so that it looks like old concrete. Just like finding someone who can make moulding to match existing moulding in a 100-year-old-house--is there anyone who makes concrete that looks like the original concrete?

Thanks,

Carla in Sac

Yes, matching the look of old concrete can be done and it was done at our house 3 years ago when we have to have structural work done on our front porch in the Chicago area. I can't say definitely that the exact same materials were used as when our home was built in 1919, but the look of the concrete matches. I can take/post pictures later if you wish.

If you google 'matching historic concrete', you'll find lots of articles on the subject.