Compute cluster/atom for two types

Hello,

I have a system with two types of particles, I want to find the clusters for each type. I do it in post-processing using Ovito and python. Do you think it more efficient to do it at run time using compute cluster/atom?

If yes, will applying a compute for each type produce two cluster lists where each list starts from ID 1? is there a way to have one list that starts from 1? if not, I will do it in post.

Thank you