What’s the difference between the Nike Zoom Rival S and IV?

I was looking on the internet for some good spikes to do the 100m, 200m and 400m in and I came across the Nike Zoom Rival S and IV. I don’t know which one to buy because there seems to be no difference.
Can somebody please tell me the difference between these two pairs spikes.

the IV is just the up 2 date version…. like how the jordan’s go from year to year. the zoom rivals when they have a new version of the shoe “still look alike a lil but the next one will have better performance” they just name it up…. so get the IV cuz they are the most up 2 date and are the best ones

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NIKE ZOOM KOBE IV 4 v Royal-Blue/White/Red lebron 8.5 $110.00

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NIKE ZOOM KOBE IV 4 v Royal-Blue/White/Red lebron 9.5 $110.00

NIKE ZOOM KOBE IV OLYMPIC 4 v Gold/White/Black/Red 10 $115.00

NIKE ZOOM KOBE IV OLYMPIC 4 v Gold/White/Black/Red 8 $115.00

NIKE ZOOM KOBE IV OLYMPIC 4 v Gold/White/Black/Red 8.5 $115.00

NIKE ZOOM KOBE IV OLYMPIC 4 v Gold/White/Black/Red 9 $115.00

NIKE ZOOM KOBE IV OLYMPIC 4 v Gold/White/Black/Red 9.5 $115.00

NIKE ZOOM KOBE IV OLYMPIC 4 v Gold/White/Black/Red 10.5 $115.00

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