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It's pine (generic name for softwood). Most of the boards in that picture look to be redwood but I can't be 100% from a picture on the interwebz.
As wood is a natural product there will always be some variation in colour, but I don't think that would account for that big a difference. So it's either a much older piece of timber or it has been stained at some point, it could also be a slightly different species such as pitch pine.
Here's my question: is this an oak (or other wood) board or just dodgy-looking pine?