Your plant does look somewhat different than typical Peperomia incana, though it could be an unusual form or hybrid of it. Peperomia 'Pixie Lime' is also similar but not quite the same. Do you have any photos of the plant flowering?
Thank you for the photo. I wanted to compare the inflorescences (flower stalks) with images online. They seem similar to some images of Peperomia incana, but less so with others. I wouldn't rule out the possibility that this is a form of P. incana, but then again, it might be something else. According to Kew, there are an astounding 1405 species of Peperomia.
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