If you've overridden it completely in the implementation layer, you won't be able to call the flow defined in the framework layer. If you have cases where you may want to do one vs the other, you may want to define them differently. For example, you could put one in a framework class and the other in an implementation class that inherits from the framework class. Or if they both need to be in the same class, you may want to circumstance the one in the implementation layer so that it is only called when X is true.
As RamGP suggested, you will need to come up with a way to be in the framework layer class context. If you have an item already defined in the implementation layer and you are calling the flow in its context, you may be out of luck. In that case, it sounds like what you might want to do is apply circumstance logic in the implementation layer so there is still a path back to the framework layer if it is needed.