I would have thought it should work as the SFP-10/25G-CSR-S is dual speed but if it doesn't work then its most likely the SFP-10/25G-CSR-S isn't auto sensing the link speed so you might need to manually set it.
Thanks for the reply, You mean manually set speed to 10G on 9500 side ? hopefully someone is in similar situation and can confirm if it works with setting speed manually.
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