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Plane razor? Not sure what that is. It does appear to be a wedge, which i'm guessing is what your saying.
If so, they are harder in as much as there's far more metal to remove. Apart from that it's...

As said, beware of buying from photo's unless they are nice, close & focused, & give a good evaluation of every aspect of the razor.
That said, the steel looks in good shape. The scales are a bit...