The new board does not have the DC-DC power option on, so can be a bit smaller. It still has the connection for the Commodore 64/C64C/C16/VIC20 keyboard, two 9 ways D connectors , mode switch and a USB port that can be mounted internally or externally.
The smaller board now allows it to be fitted next to a Raspberry Pi with it's side connectors accessible via the C64 cartridge port.
The internal connection can also be used if you want the USB cable to exit from the rear.
The external USB connector option has the USB port in what was the power connector hole on the side of the C64. The push button where the power switch used to be is the mode switch. This changes the keyboard mapping between normal desktop use and emulator mode. See Commodore USB keyboard kits for more information of the mappings.
This can be fitted to a Commodore 16 or VIC20, but the metalwork from a C64 would be required to fit the board or leave the metal work off.
The board also fits into the Commodore 64C case, although some adjustment may be required to the keyboard support brackets, as the profile of the joystick connectors is slightly different
This is available as a kit, containing the USB keyboard and dual joystick controller, mounting pillars, replacement LED and USB lead.
The kit can be ordered from my Tindie Store.