A lot of scalar numbers are specified in ways that may be appropriate for one application but not another.

Timing specifications do not typically have a correlation to GBW or Ft.  Timing specs only describe how long it takes the switch to turn on or off, which then relates to the maximum switching frequency.  GBW or Ft would be related more to the capacitance of the switch and its on resistance.   So a switch with a 10pF capacitance and 10ohm Ron would have an Ft of about 1.6GHz, likely a much higher equivalent bandwidth than the switching speed.

Timing specifications do not typically have a correlation to GBW or Ft.  Timing specs only describe how long it takes the switch to turn on or off, which then relates to the maximum switching frequency.  GBW or Ft would be related more to the capacitance of the switch and its on resistance.   So a switch with a 10pF capacitance and 10ohm Ron would have an Ft of about 1.6GHz, likely a much higher equivalent bandwidth than the switching speed.