"These roles are increasingly converging. But they have different emphases. Account Management typically has a greater emphasis on sales first, customer support and servicing second. Customer Success leans the other way — focused first on driving the success of the customer, helping them have a strategy, helping them make key process changes, assisting with the implementation of key playbooks and processes and products. Then sales is second.
"It's also based on industry. Some product offerings or company structures put the rep on hundreds or even a thousand accounts. In that case, what they're really doing is guiding the customer through adding additional solutions, making additional purchases. That's more aligned with an Account Management role. Customer Success is much more focused on targeted interventions to help customers adopt key workflows and processes that drive the actual success."
Why it matters
The two roles are not interchangeable, but the distinction is about order of priority, not separation of duties. A CSM does have commercial responsibilities; an AM does have to ensure customers succeed. The question is which one comes first when they conflict. Companies that confuse the two - usually by making one role do both jobs equally - produce reps who do neither well. Companies that decide intentionally which orientation matches their product, customer base, and account load produce reps who consistently drive outcomes and revenue.
Example
A horizontal SaaS company with 1,200 customers per rep tries to assign every rep a "Customer Success Manager" title, expecting them to drive deep outcome-based engagement. The math doesn't work - at 1,200 accounts, no rep can run strategic interventions on every account. The reps default to commercial activity (renewals, expansion conversations) and the title becomes misleading internally and to customers. The fix is to acknowledge the actual motion: at 1,200 accounts per rep, this is an Account Management function with proactive outreach; intentional success interventions happen for the top tier of accounts only. A different company - an enterprise platform with 30 accounts per rep - should be running a true Customer Success function with deep, outcome-anchored engagement at every account.