Is the Bondi Radius the Same as the Schwarzschild radius? $$2MG/c^2$$ 

This is the expression for both, but some authors use one name and it has confused me. Is there any distinction?
The Bondi radius is $2MG/s^2$ where M is the mass, G is the gravitational constant and $s$ is the speed of sound in the medium of the accretion disk.  It represents the boundary between sub-sonic and super-sonic infall of matter into the black hole.

The Schwartzchild radius is $2MG/c^2$ where $c$ is the speed of light and is the radius of the event horizon.