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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