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Yes, the tire diameter is absolutely essential with the AWD and it has to be within 1% front to rear.
What ppl often confuse is the fact, that the 19/20" combo is the closest possible to equal in terms of tire circumfense. The 275/35 19 is only marginally smaller than the 285/30 20". The 285/35 19" would already be too big. Just because the wheels are different diameters does not mean the tires are too.
If you drive a staggered setup, be sure to be in the 1% tolerance frame. Also the front tire must not be bigger in diameter than the rear. Smaller is fine. You can go for a 275/30 20" + 285/30 20" setup, or of course square 275 or 285, whatever you fancy.
I myself will put the PS4s* in 285/30 20" all around in my AWD M4.
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