Need advice with pin connection of an LCD module
That's impossible to answer, because these different grounds were added for a reason – typically, signal integrity.

If your cable is short and your environment low in noise and both ends can work with the slightly changed impedance, and that ground line is actually connected to the other ground lines at the module and not e.g. a dedicated power ground: maybe.

If you rely on this to be reliable: well, chances are you broke one of your device's connections and now, everything might happen.