After 8 years in the game I decided to try the Spit 14 out. Is there anything specific to flying the Spit 14 and how does it compare to the Spit 16 or are they two different aircraft ?
The thread is getting rather long, so please excuse me for not reading the whole thing.
To answer your question, 14 and 16 are about as different as they can possibly be. Different engine, prop, wings (not just the clipped part, the internal structure of the wing is different), and tail. The purposes of the aircraft are also different, 16 is a low altitude ground attack fighter, 14 is a mid-high altitude air-superiority fighter.
When flying the 14, try to keep it above 10K, it's fast there, faster than a P-51.
For combat use vertical maneuvers. It has a high power to weight ratio and as every other spit keeps it's energy for a long time. Try not to get too slow (bellow 230ish), it's heavier than most other spits and you will most likely be at a disadvantage. Stay between 260 and 360.
Practice low energy high AoA maneuvering offline, the thing is very torqey. Make sure the torque doesn't kill you, you can actually learn to take advantage of it.
Try to avoid using your flaps in combat, you will bleed off a lot of energy with them down.
If you get in trouble, Spit14 accelerates very fast, if you can't outrun something you can outclimb it. 109K4 is an exception, but they are so close that the numbers depend on the fuel state of both aircraft.
When in cruise burn wing tanks first, then the top tank, then the bottom. The reason why you are leaving the bottom for last is it is self-sealing and armored, the other ones are not. Also the bottom tank is kinda small, so by the time you start burning it it's probably time to head home. The plane does burn quite a lot of fuel, do not use WEP unless you actually need it, WEP uses even more fuel, and it's noticeable.
Best glide speed is 135mph.
Let me know if you have any more specific questions.
BTW, do note that I have not been playing for a year and got back only last week, there is a small possibility I might be forgetting something.