The wavelength of emitted radiation when an electron jumps orbits in the Bohr atomic model is given by

1/$\lambda $ = ${R}_{H}$ ($\frac{1}{{n}_{f}^{2}}$ - $\frac{1}{{n}_{i}^{2}}$) ${Z}^{2}$

But that of X-Ray emission is given by

1/$\lambda $ = $1.1\times {10}^{7}$ ($\frac{1}{{n}_{f}^{2}}$ - $\frac{1}{{n}_{i}^{2}}$) $(Z-1{)}^{2}$

Why is there a difference? Why aren't X-Rays treated like any other emissions?

1/$\lambda $ = ${R}_{H}$ ($\frac{1}{{n}_{f}^{2}}$ - $\frac{1}{{n}_{i}^{2}}$) ${Z}^{2}$

But that of X-Ray emission is given by

1/$\lambda $ = $1.1\times {10}^{7}$ ($\frac{1}{{n}_{f}^{2}}$ - $\frac{1}{{n}_{i}^{2}}$) $(Z-1{)}^{2}$

Why is there a difference? Why aren't X-Rays treated like any other emissions?