The original module with the built in RGB test Leds is perfect for developing code but the two different connectors aren't really necessary if after the development you then use it to control/make an actual keyboard.

I have upgraded the module to use a single 34 pin connector and replaced the two switches with pin headers. The extra pins also allow adequate current for the RGB Leds, considering your PC's USB supplies 2 Amps Max @ 5V.

In tests at full brightness, the keyboard draws just under 1.2 Amps from the USB. Each pin on the connector is rated at about 1 Amp (we now use 3 pins for supply and ground). 

There are two major advantage to using a Module and Basic (bare-bones) Keyboard as apposed to getting a fully assembled keyboard...

1. Reduced Costs as Keyboard can be assembled by hand (parts are easy enough to solder)...
2. The fully assembled Module is relatively inexpensive, hand assembly would be very difficult...