Dear,
i have confirmed this from MODERN DIGITAL AND ANALOG COMM. SYSTEM (B.P. LATHI),on page 328, that both terminologies are same thing.
it tells 3 methods of time recovery, i am writing one of it for ur understanding (if u have this book then read it by urself.)
it says,
"digital signal contains a descrete component of the clock frequency itself. when the on-off binary signal is applied to a resonant circuit tuned to the clock frequency, the output signal is the desired clock signal"
i hope it will help u understand.
Naveed