Will dell optiplex 755dt mb fit in a optiplex gx620dt

[lost c2d]

hi all my first question on here,and i want fix my old optiplex gx620 dt but not the tower ,does anyone know if it ill fit or any problems thanks.

 

[C12Friedman]

Both boards appear to have the same motherboard mounting systems so I think a swap would not be too difficult as far as fit is concerned.