difference between diffusion convolution and MCL algorithm.

[ICDI0906]

hello~
as I know, MCL is a clustering algorithm for the directed graph. And its form is very similar to the diffusion convolution except that MCL has a parameter r to control the scale while diffusion convolution uses the theta to smooth. so what is the difference between them.MCL refers to this article, which is easy to understand.
looking forward to your reply~