Esbilac question

So my local PetCo is completely out of the regular Esbilac Puppy Powder formula until the day after next. They Do have the 2nd step powder formula in stock. Would that work to hold my soon to be released babies that are almost 13 weeks old? Or would the regular liquid esbilac do? I know the powder kind is preferred and better for them.

Normally, I would say don't ever use the Second Step or the liquid Esbilac but at their age i'm not as concerned. In all honesty though, at their age, skipping formula for a couple of days wouldn't even be a tragedy. ( If you think they have to have something, then I would do the second step, if they'll take it. )