As dakski said, saliva on a rodent being swallowed is normal, & with an appetite & no other symptoms of RI, I'd say that snake is likely just fine.
I'd be concerned about the older one you recently adopted though, & allowing him into her cage was a terrible idea, since she has been wheezing according to you.
They should have been quarantined from each other...so now you'll have to watch for signs of RI that may or may not develop in him, & yes, you should probably
get the second one checked out IF there is no other explanation for her wheezing (like going into our just out of a shed).
Be very careful about using bleach to clean cages: there must be NO smell remaining. It's much easier to use generic chlorhexidine
(sold at feed stores etc) or F10, since either one is greatly diluted (a little bottle will last a long time with only a couple snakes) and
it doesn't need to be rinsed off cages & equipment...only wiped dry.