Dumeril's Boas have very slow metabolisms so I would guess that it isn't as big of an issue as it would be with a faster growing snake.
I'm sure that a snakes final size can be reduced if they don't get enough food in the early years. Though I couldn't even guess at how long it would take.
My guess is that if you can get your Dum eating consistently there won't be any "damage"
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