There are some P channel and N channel mosfets which operate as swiches in figure 1. Also, there is a pull-down resistor for each mosfet which prevents the mosfet's gate being float when the VCC is not present.
However, in 2nd design all those resisters have been eliminated. They've been replaced with only one resistor which is shared between all mosfets. This resistor also acts as a pull-down resistor for gates (If it is not a pull-down resistor let me know).
The purpose of these designs is to work as switches when the button has been pressed and they are not intended to function in high frequencies.