Hello, Prosperent. You can check this compatibility matrix to make sure that the 10G SFP module for your WS-C4948-10GE will be compatible:
Compatibility Matrix:
http://www.cisco.com/c/en/us/td/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6974.html
Please send me an e-mail at (adawa@cisco.com), in case you have additional concerns or need local Cisco support. Kind regards.