To add to what Garabo stated, the K70 BSP clocks the core at 120MHz generated from the 50MHz external oscillator, as shown in the MQX Getting Started guide. But if a BSP is cloned and ported to your K60F150 device, the clock configuration in the BSP can be modified to clock the core at 150MHz. An easy way to change the clock configuration in the BSP like this is to use Processor Expert, and this is documented in the file installed with MQX at
<MQX Installation Directory>\doc\tools\cw\Howto_SetupKinetisClock_UsingPE.pdf
Also, another good BSP that could be used to port to a K60F150 device is the twrk60f120m BSP. This BSP also clocks the core at 120MHz and can be updated to 150MHz. But it could require less changes. If you were using a K60F device with external DRAM, the K70 BSP would be a better fit to start with since it supports DDR2. A K60F without DRAM is probably closer to the twrk60f120m BSP.
