Sound vibrations are conducted through any wall with solid material. Light Steel Framing is very slightly better at acoustic insulation than timber framing, due to the flange flexibility. However, the differences are only 1 or 2 decibels and not usually noticeable.
This means that a different wall design is used between apartments or flats. This can be one wall with several layers of gypsum linings plus sound insulating fiberglass or consist of two separate walls (with each insulated and disconnected from one another). Care must be taken when cutting penetrations into the inter-tenancy walls (e.g, for power, TV outlets, air-conditioning units etc) as these will provide a sound path.