You will want to feed them in succession.
You can try the "piggie-backing" method where you feed the larger rodent first, and as the snake is in the final stages of eating the first place the head of the second rodent in the still open mouth.
When my snakes are in these inbetween stages I like to go a little over what I normally would feed. Over feeding is only an issue over the long term. By feeding larger rodents the snake will quickly grow into its new meals. But it has to be able to eat them.
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