Yes and that depends on how much muscle fiber you have and how much you have wired up to be available. Seems to me both those factors would figure in???
Can't find it now but awhile ago there was a thread or poll discussing %bodyweight people were training A+A with. I would think that would be a relevant number in determining what is "heavy" for a person?
I think A+A plays by the same rules that Q&D does. Pavel says in "The Quick and The Dead",
"When we tested various experimental plans, we discovered that while everyone improved on Q&D, to our great surprise, experienced athletes improved the most. Fighters, military special operators... guys who could press the Besast for reps made much more dramatic progress-- in both absolute and relative terms-- than ladies and gents who were still working their way up to the Simple standard."
So, of course, you do what you can do. But if you can do more, you can get more out of it. Someone who has devloped more strength, power, and muscle mass through their training has a bigger tool for the job, and a bigger potential to get more return on the investment of work.
An analogy: Let's say we wanted a group of people to analyze recent exercise science studies. We have an M.D. who is a lifter, an M.D. who does not exercise except doing the elliptical at the gym, a high-school educated lifter, and a high-school educated carpenter who does no exercise other than his work. We give them all 10 hours to read 10 exercise science studies, and brief us on the results. Who is going to be able to tell us the most about the studies -- i.e., who has the bigger tool (brain+ analytical training + educational background) for the job? I would place them in the order listed. The M.D. who is a lifter has a huge knowledge base, both medical and exercise-related, to accurately analyze the studies. The M.D. who doesn't exercise is good at reading studies, but will be less good at getting meaningful information from them relative to exercise. The high-school-educated lifter would know a lot about the subject matter but likely has a non-disciplined analytical skill. The carpenter would likely say they have no idea what any of it is about... and why don't these people pick up some real tools and do some real work?!
With that analogy you can see how different people can get more "return" out of 10 hours of work. It is the same for some types of physical training.
Back to the more relevant issue of the size of the person -- of course height matters, and possibly frame size... but short/small people can develop a lot of muscle. It is possible. Not to say they need to... but, they can. And if they do, they can throw around more than 16kg on a regular basis. And if they can do that, they can get more out of A+A training.