@ ppatierno - no problem ppatierno. The difference between the two are as followed:
The grounding of pin 9 (shorting pin 9 to pin 10) on Socket 14 is a special pin designated to place the board into TinyBooter mode (only on Hydra) for situations when a program that the user writes may cause your board to lock up and become unresponsive. If this scenario were to take place, there needs to be a way to bypass the system to gain some level of functionality, in this case, the ability to erase a user program and/or even to erase and replace the firmware, should that have become corrupted.
On Socket 3 or 4, the need to ground pin 8 (shorting pin 8 to pin 10) is necessary to bypass the flash microchip on the board to allow the Hydra’s processor to be booted into a mode where it is ready to accept commands to erase the flash chip and to rewrite the TinyBooter to allow the re installation of the firmware.