You can't use [confirm] or [details] with CB Auto Actions. They're specifically for the registration workflows emails. Registration workflows emails support IF substitutions so you should be able to do what you're wanting using those. Example as follows.
[cb:if cb_profiletype="professional"]This is an email body for Professional profile types.[/cb:if]
[cb:if cb_profiletype="developer"]This is an email body for Developer profile types.[/cb:if]
See our substitutions tutorial below for further substitution usage information. IF usage explained at bottom with examples.
www.joomlapolis.com/documentation/279-community-builder/tutorials/18353-using-substitutions-throughout-cb