ASRock H97M Pro4 Ram Installation

[Wraithborne]

I'm doing my first self-built computer, and I'm obviously a bit nervous about it. At the moment I'm a bit confused by the RAM installation. In a related guide the 2 RAM sticks were plugged into the two blue slots (1 and 3, or A1 and B1), but in the manual it appears as though it says to do the opposite? I've included a picture of the manual page in question. If I only have two sticks, should I be plugging them into A2 and B2 instead on this motherboard? Does it matter?

 

[rgd1101]

not matter as long as is either ab1
or ab2

 

[Dark Lord of Tech]

If I only have two sticks, should I be plugging them into A2 and B2 instead on this motherboard? Does it matter? Yes that would be a good scenario.

Color match , both blue slots filled or both black slots filled.