What matters is clearance and airflow around the ballast in the base of the CFL.
CFL lamps that run in environments where airflow cannot take away the excess heat will suffer a much shorter lifespan. The higher the wattage, the more heat they will generate, though much reduced from what using an over-wattage incandescent (which can create a fire hazard) will generate.
So, basically the heat danger and extra current from using a too high wattage incandescent bulb is not present, but the CFL might, in the wrong fixture, be a danger to itself.
The whole wattage equivalent thing is because we've come to equate brightness with power dissipation, not the lumens produced or the efficiency in lumens per watt.
It will take 4 1/3 CFL lamps at 23 watts each to equal the power that an incandescent 100W bulb will require.