I’m not able to sort by “PriceCharting ID” in Game Connect. Not sure if this is new behavior or if it has been like this for long.
Sorting by PC ID has never been possible (yet).
Will check if that can be added.
Sorry for the delay in getting back to you on this.
Allowing correct sorting on that field proved more complex than I thought.
But… it is possible now, you can now sort on the PriceCharting ID field!
Also, we took the opportunity to optimize and fix some of the, very complex, PriceCharting code.
I appreciate this a lot 
thanks for all the amazing work put into this solution