They should be fully interchangeable. Not just the internals, but also the tip can be swapped between alpha matic and Tk matic.
However, you need to be careful, as Tk matic with the plastic body can have either full metal internals for the early versions, or plastic for the late ones.
There are also intermediary versions. Mine has plastic in the tip and cilindrical clutch (like on your L in the first picture), but the piece on the front of the lead tube is brass. Also I can’t remove the lead tube from mine.