PC Peripherals Noctua fan dilemma

I have a 2000 rpm Noctua nf-f12 which is out of stock everywhere now, i can get either a 1500rpm or 3000rpm fan but i want to use the fans as a push pull config on my tower cooler (will use a splitter and connect to cpu fan header)

1)Do you guys think the change in this rpm can cause turbulence and improper air flow?
2)Also if i do get the 3000 rpm one, should that be the primary fan on the splitter or secondary?
3)And lastly which should be the pull and the push fan if i get the 3000 rpm one?

Thanks in advance :)
 
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