MCU clock drift and radio frequency drift - are they the same?
Is it the case that one node will communicate using 2405 MHz and the
  other 2405 MHz + 10 ppm?


Yes, one will transmit at 2405 MHz and the other will use 2405.02405 MHz plus there will be jitter caused by the PLL (in both systems) and this may be in the region of +/- 100 ppm at a variable frequency in the hundreds of Hz to low kHz range (with some randomness too). This dwarfs the static 10 ppm error.

When it comes to receiving, it is likely that the "misaligned" receiver will lock-onto the precise transmission frequency irrespective of its own slightly misaligned local clock. This can also be done using PLL techniques.

On more complex transmissions where the actual centre frequency can be missing (such as in phase modulation or other suppressed carrier types), a special PLL (called a Costas loop) is employed.