The VS Castlevania Reproduction Daughter Card is a Nintendo daughter card reproduction. It is compatible with the PPU list in the drop down list now, so you may use whatever PPU that you already have!
This daughter card does not come with a PPU or CPU.
Can this card be used for top gun also?
You would need to change out the ROM and supply your own CPU and PPU. This is an exact duplicate reproduction of the original. Unfortunately, I only supply Castlevania ROMs with the kit, but, you as the end user can replace the ROM and be able to play Top Gun.