> Does B::Concise distinguish between these

Yes, for instance if a sub is not predefined in the STASH you'll see the *main::g or rather *g form.

Also in (for me) random cases where it's predefined.

Update

 
~/perl $ perl -MO=Concise,-exec -e'g();'
1  <0> enter v
2  <;> nextstate(main 1 -e:1) v:{
3  <0> pushmark s
4  <#> gv[*g] s/EARLYCV
5  <1> entersub[t2] vKS/TARG
6  <@> leave[1 ref] vKP/REFC
-e syntax OK
~/perl $
[download]

s/EARLYCV means the sub was unknown at compile time.

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