Any transfer isn’t exact, unfortunately. That’s the part I’ve hated the most when trialling ‘same aid’ in different forms (eg comparing 70 to 90, getting tcoil, r vs battery).
Also, keep in mind, that transfer means gain curves (I always had several db of difference, but it wasn’t same on each, eg just lowereing all wasn’t the solution), but options don’t transfer. So thay have to be manually changed, eg more/less of noise cancelling than default, soft sounds, wind block and whatnot.
That is saved in target, but target doesn’t allow to open simultaneously two setups to compare them. Screenshots could work. But you need bunch of them. Maybe better to make video on phone going through old settings and then play/pause when checking new settings.
My solution is that I run target in virtualbox anyway, so I just cloned that virtual machine and I run 2 to 3 in parallel, depending how many setups I want to compare.
But dispensers don’t have such ability usually.