I've been a practicing AB for more than 30 years, and I've been changed by 16 different women during that time ... only a couple were one-time things, and most babysat me for months or years on end. I should add that I'm a heterosexual male and I've only had female caregivers.
Not a single caregiver changed me in the same way. A few were very clinical and quite fast; I was back on the floor playing before I knew what was happening. Most lavished time and attention on me as they would have a real baby.
How these ladies reacted to changing a dirty diaper has also been interesting to observe. Most had absolutely no comment or feedback, and those who did were never critical or shaming. The best babysitters just got me clean and put me in a clean diaper; they did nothing to create a sense of embarrassment on my part.
If someone is proficient at changing real babies, I've found that they usually can change an adult baby without much difficulty. The problem only arises if the caregiver hasn't had kids, hasn't done a lot of babysitting "real" babies, or only has adult caregiving experience. My best sitters have had a good deal of childcare experience, which gives them an idea of how I want to be treated, but they also have some adult caregiving experience so changing an adult diaper is something to which they've become accustomed.