Canada CRJ - would parts be salvaged and reused?

I don't think that's necessarily true. Rotable aircraft components are routinely overhauled, swapped, and sold, in all cases subject to rigorous testing and certification by the FAA/EASA/whatever relevant body. Customers can certainly have black and white policies around the use of overhauled components in their own aircraft, but provided they meet the relevant standards after inspection I don't believe there's any hard rule that says rotable components from a written-off aircraft can't be used. If the impact forces were severe enough that nothing can pass certification then yeah, it's a total write off, but we don't know that yet. If it weren't possible to overhaul and continue using parts, damaged but repairable airframes could never return to service ([example](https://en.wikipedia.org/wiki/Qantas_Flight_1), [example](https://en.wikipedia.org/wiki/British_Airways_Flight_2276), [example](https://aviation-safety.net/wikibase/343043), ...), and colourful stories like the [ghosts of EA401](https://en.wikipedia.org/wiki/Eastern_Air_Lines_Flight_401#Reported_ghost_sightings) couldn't exist.