All snakes grow at different rates. Even clutchmates.
I had a snake that was half the size of her sister at 2 months old.
Both ate the same meals weekly.
What is your humidity % of both enclosures? It just sounds like you need to increase your humidity. You can do a few things.
Here are some options:
1) Cover 90% of their enclosure lid with a damp towel, plexiglass, or tin foil (I'm assuming you're using a glass tank)
2) use a larger water dish (larger dish has a larger surface area to allow greater evaporation)
3) move water dish to the hot side of the enclosure
4) Use a different substrate such as coco husk or cypress mulch (these hold humidity really well)
5) make a humid hide (a Tupperware container with a hole in the lid to allow the snake to go in and out. And place a damp towel or damp moss inside. The snake has a choice to use the hide whenever it wants humidity)
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