Can i host both my dev and prod cluster in the same signoz account while using self hosted?

Do you mean sending prod and staging data to same signoz instance or do you mean running multiple signoz clusters with same license key ?

yes sending the prod and staging data to a same signoz instance am self hosting

You can do it , just add this resource attribute https://opentelemetry.io/docs/specs/semconv/resource/deployment-environment/ to easily distinguish between the two envs