WRF vs WMR What's the difference?

The .22 WRF was introduced by Winchester in 1890 and the .22 WMR was introduced in 1959, but what makes them so different and what makes them so similar? Let's take a look at two of my favorite rimfire rounds!
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Arizona Ghostriders
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Guns Of The West
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Chuckin'
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Squib Load
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