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I do not think one could tell the difference. Iwasaki chose Swedish steel for his razors because it could be modified to become similar in properties to Tamahagane.
The Tamahagane version should...

Here is my most prized Iwasaki -western Tamahagane. It shaves like a dream.
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I have one more in the stash that needs some more polishing, then etch to show the hamon and new scales.

The razor is still with me, and is never leaving the den, it is extremely smooth shaver.

Here some newer pics of it.

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