Actually, I see no such ambiguity. It depends on whether you use la
or not:
Kiel la administranto de la korporacio, mi pensas, ke li eraras.
You share the opinion with the manager
Kiel administranto de la korporacio, mi pensas, ke li eraras.
You are the (acting) manager and that makes a difference on your opinion.
In short, if you use kiel
for a role you don't use the article la
before the role. If you do, you mean the comparison (which you can also do with samkiel
or same kiel
).