Nameserver using main shared ip?

on my box NS1 is using the same ip as the Main shared IP then NS2 is different..

34.22.255.200 < main ip + NS1
34.22.255.201 < NS2
for xample...

Is it best to have it setup as
34.22.255.200 < main ip
34.22.255.201 < NS1
34.22.255.202 <NS2
and then spread the sites hosted over the other remaining ip's and just have the main domain on the shared ip?

or doesnt it matter having a nameserver the same as the main shared one ive had it like this for three months so far.. just curious...

any clarification would be greatly appreciated ^.^

 

 

 

 

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