The Z-8K is a dedicated PLAAF SAR variant based on the older Z-8A, whereas the Z-8F is or better to say was the project designation for the improved variant, which became later the AC313 or Z-18 and as such the Z-18F is the ASW variant of that type.
Thanks for the replay. Do you know of any obvious visual differences between the Z-8K and the Z-8A? I had thought the Z-8K was an improved the Z-8F. While the Z-18 series was all from the AC313.
Thanks for the help.