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The first is a Control2 kit which comes with an old PCB version. That version does not contain the backlight switching circuit, so the display backlight will be on even when the board is in standby. If you don't need the standby mode, or use a VFD that's no problem. You can also build the switch circuit on a piece of veroboard - you will get the parts with the kit.
Second kit is a "special edition" of the Phono1 kit. It's the same circuit as the standard version, but comes with cheaper parts (matched/selected 2% or 5% instead of 1%, polyester instead of polypropylene etc.). It still comes with metal film resistors and the OP275 chips, so the noise level will be the same.