do ABCD bands matter?

I am using wms 40 mini pros; i have band A and band C. I want to add two or more of the same units to my system. can they be any band ( A B C D) or do they have to be different from the ones I am already using

If i were to get wms 420 units, since they have multiple channels, would I have to use different bands with them or could they be the same bands as either the 420s or the mini pros?

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