If you have two of the same rifle you can set them up as close as possible.
For Worlds in 2018 in Poland I had two HW97K rifles. Fully tuned and ready to go, scope for each gun and mounted on each gun. But only brought one stock.
When doing this you can put your spare action in your main stock and confirm numbers, check zero and then put it back in your case, reinstall your main action and continue on. I know with my tx I cna take it out of the stock, and disassemble the rifle, trigger out, spring/ guide, comp tube etc. And then throw it all back together and it will only be off a few clicks.
I recommend having a spare for the possibility of equipment failure.