The priority when getting a new snake is for the snake to eat for you, YOUR or your wife's priorities in this case should be second.

I would recommend offering live (same prey type than preciously offered) for at least 3 to 4 feeding.

Once your snake is well establish than you can attempt to switch.

Switching a well established snakes is often easier than trying to switch a snake that is not well established and had not eating for you yet.

Also remember that while most snakes can be switch, some might take time, some might never do and as a snake owner you should always be ready and willing to feed live.