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Would it be correct to assume that a controller class is the same as a service class in the application service layer.
e.g.
CustomerService is the same as CustomerController
No, The word Controller is generally used to represent a class that is responsible for controlling the behavior or access patterns for some downstream (closer to UI) code component like the UI screen itself, or the interactions between some downstream component and an upstream compoenent that contains (or models) the data used by that downstream component.
A Service component is a component that provides some function or implements a process that is required by the applications business logic (or in some cases by infrastructure requirements or even application design requirements) that can be encapsulated in a single class to be isolated from other pieces of application functionality.