It's basically the same frequency range of of up to 1Ghz.
Docsis 3.0 downstream spec starts from 108Mhz to 1.002Ghz. Upstream from 5Mhz to 85Mhz.
Docsis 2.0 downstream spec starts from 88Mhz to 860Mhz. Upstream from 5Mhz to 42Mhz.
Docsis 3.0 uses multi-channel bonding while 2.0 does not.
No Docsis modem for consumer use actually uses close to the full spectrum cause of analog+digital channels.
Docsis 3.0 physical layer specs, RF transmission range in section 5:
»www.cablelabs.com/specifications ··· 0121.pdf
Docsis 2.0 RF interface specs, RF transmission range in section 4:
»www.cablelabs.com/specifications ··· 0422.pdf
Cable TV and internet are not sharing frequency channels so they should not be interfering with each other.
Analog channels occupy from the 50Mhz up to 300 or 400Mhz range depending on how many your cable company provides. Digital TV channels 'usually' start operating on the 500Mhz channels up to 700Mhz, while cable internet usually operates the upper 700Mhz up to 900Mhz. Note the standard in North America for a channel is 6Mhz in width which allows one analog channel, or carries enough bandwidth for approximately 2 HD channels or 10 SD channels.