Which of the following pairs represents linkage isomers?

$\left[\mathrm{Pd}{\left({\mathrm{PPh}}_3\right)}_2(\mathrm{NCS}{)}_2\right]$ and $\left[\mathrm{Pd}{\left({\mathrm{PPh}}_3\right)}_2\left({\mathrm{SCN}}_2\right]\right.$are linkage isomers.

Linkage isomers are isomers with the same chemical formula but different arrangements of the ligand atom and the central metal atom.

Hence, option A is correct.