Nope, there isn't an extra step.  I've got a script that looks about the same as markschum's example, and it works instantly.

You would need an error check on the body parts and parm names, like this

import poser

scene=poser.Scene()

fig1=scene.Figure('FirstVickyOrSomething')

fig2=scene.Figure('SecondVickyOrWhatever')

for a1 in fig1.Actors():
    try:
        a2=fig2.Actor(a1.Name())
    except:
        continue
    for p1 in a1.Parameters():
        try:
            p2=a2.Parameter(p1.Name())
        except:
            continue
        p2.SetMaxValue(p1.MaxValue())
        p2.SetMinValue(p1.MinValue())
       

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