If you are referring to the value of bitcoin in terms of Tether, yes, it's almost the same with the value of bitcoin in terms of USD since USD and usdt has almost the same value.

On the otherhand, USDT doesn't fluctuates as bitcoin does.
USDT is an stablecoin which means it has low volatiliy.
That's also a reason why USDT has low risk to fluctuate as this coin was made to have same price with USD.