There is a way... mwahaha. I've missed this.... this... being able to do something. Being able to create something that didn't exist, from nothing but my own idea and some very rusty programming skills. This mental challenge. ☺️
(And the way is to search for the url of the status that is to be boosted - which is included in the data from the old instance - and perform that search on the new instance specifying "resolve=true", and that gives you the new id.)