Can you factorize these squares?

Algebra Level 2

\[{\begin{cases} a^2 - b^2 &=& 5 \\ c^2 + d^2 &=& 74 \\ (ac)^2 - (bd)^2 &=& 341 \\ (ad)^2 - (bc)^2 &=& ? \end{cases} } \]

Considering the constraints above, what is the value of the last equation?