Some results on uniqueness of an entire function with its shift difference

In the paper, we have shown that every entire solution of the differential difference equation $\Delta_{\eta}^{m}f-Q_1=(\Delta_{\eta}^{k}f-Q_{2})e^{P}$ satisfy hyper order of $f=$degree of $P$ and using this result we prove differential difference counter part Br\"uck conjecture. Also we have proved differential difference counter part Br\"uck conjecture for the special case of hyper order of $f<\frac{1}{2}$.