Do MCASP input pins need to be in order?

I am using a Circular Microphone Board that has 4 I2S outputs with 8 channels in total and getting this audio into a Beaglebone AI. I am able to input 2 channels and record the audio right now with mcasp1_axr0 interface.
However I want to record the 8 channels now, so I need 4 interfaces and my question is: must these interfaces be mcasp1_axr0, mcasp1_axr1, mcasp1_axr2 and mcasp1_axr3. Or can they be for exaple, mcasp1_axr0, mcasp1_axr1, mcasp1_axr8 and mcasp1_axr9?

Thanks in advance