Note that the Bf 109K-4 performance is purely calculated so take it with a grain of salt (most likely optimistic).
I am unsure of the context of the Fw 190D-9's source.
The Spitfire's airframe was originally a Mk V and was half a year old without combat history when the tests were done.
The P-51D's airframe was a year old when the tests were carried out and most likely saw combat in late 44/early 45.
