Hello,
Yes, this will be fine mixing the 9500s and 9336s for your spines.
Also, if you want to compare the differences refer to the following data sheets:
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/datasheet-c78-732088.html
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/datasheet-c78-731792.html
Hope this helps,
Michael G
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