IIRC, those are plug screws for locating holes used in manufacture. I don't know why Remington needed them and FN didn't, but they are not operating parts. Browning's agreements with the companies that bought his patents or paid him royalties didn't preclude the manufacturers from changing or improving the product as they saw fit, and all the companies that made Browning design guns made some changes to the basic design. Still, the FN and Remington versions of those little .22's are so similar that many parts will interchange and they are, to all intents and purposes, the same gun. (There are also differences between the .22 Short and .22 LR versions of each manufacturer.)
Jim
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