DO NOT give that snake gerbils - and do not recommend it. Seriously.
To the OP.
The only real diff is the amount of Ash, I think chicks have less ash than rodents.
Base components are not that much different between chicks, mice and rats.
If the snake is eating chicks that is fine, he-she is not going to be malnourished. There is no rush to get it switched over.
Bruce