Cloning a legit sb5100 to a sb5100 or 5101n

[jenom]

have a legit cable subscription with an activated, working SB5100 modem
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also have a spare SB5101 and thinking of getting a SB5101N too

would like to copy my own working settings from my old SB5100 to make the SB5101 work , (so I can use it as a spare one at my own location, if needed when one day the old SB5100 dies)
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--can this be done by using Blackcat+jtag+SigmaX2+Fercsa+SB5100Mod ??
--is it enough to make it a same HFC-MAC and SerialNumber ?
--or there is more to it ?

Thanks!