If I had to guess, the 21" VR barrel probably is threaded for chokes where the 18.5 security barrel isn't. That's the only thing that'll affect the pattern. Barrel length will have no bearing on it.
That being said Cracked91, if you want an 18.5" Remchoke barrel for that 870 youth Remington does make one. My daughter's gun is set up so.
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