Completely different camera. The FZ-200 has a 1/2.3” sensor. There’s no way you’re getting f/2.8 at 600mm equivalent on a 1” sensor unless the lens is huge. The ZS-200 maxes out at 360mm and at something like f/6.4.
Have ZS-200 for several years and love it. The 1” sensor is a real plus, but more expensive. Bought it used from B&H. Our other camera is a Nikon p510 which has more zoom but smaller sensor. It has more raw reach, but is only better for far distant birds.