There's a map right on their site, but it says for the European version of the 919.
My question is would this work on a US version 919? Is there a huge difference in the PCMs for US & EURO and such?
I don't know what the differences and don't think you need to worry about it.
You have a USA bike with slipons, it's that basic.
Try the map, try other maps.
If you want some reassurance, do a map compare of it with the PC software against the many maps floating around via this site.
I think the PCMs are likely the same.
Do a part number comparison to find out for sure.
Honda usually gives every unique selling region it's own ECU mapping I would be very surprised to find that they use the same mapping in the US Spec ECU versus the UK Spec ECU, but I suppose it could happen...