Big difference between BPM admin and BPM dev roles and responsibilities.
Since this forum post is old, you probably figured this out :)
Tactically, a diversely skilled BPM dev can perform many BPM admin tasks, snapshot process app deployments, user/group/profile configs, monitoring BPM process and process center health, even applying maintenance updates and patches...BUT
a skilled BPm admin also becomes proficient with WebSphere ND admin and automation takes a learning skills curve, the BPM admin must support several BPM deployment environments : Dev, Test, QA, Prod, and must automate alot of tasks with scipting to survive. Hope this helps a little.
Lee!