Ash or Walnut? Or Something else?

I dug this out of a customers garden a few weekends back. I can't tell the difference between the two species myself so thought I'd ask for a second opinion

 

I would say Ash, definitely not a walnut

 

I've got some butternut tree youngsters (in the juglans family) and they have pinnate leaves too. I also have ash seedlings! I'll try to take photos tomorrow to give a comparison.

 

I've got a Hickory, (possibly shell bark), so related, butternuts are unusual, here Hickories are not common either.
I find the Hickory has the same fruity scent when you crush the leaves that Walnuts have.

 

Definitely a fruity smell from the butternut leaves.

Butternut - enormous leaflets

Young ash seedling, tiny leaflets, but even full grown, the leaves are smaller than the butternut

 

Sorry - heartnut not butternut - just checked label. Same family though

 

Never heard of heart nut, its a new one on me.
Just googled and it sounds interesting, have you had any nuts?
If you dont mind me asking.

 

Ailantifolia says it all regarding foliage, its an ailanthus that needs cutting down in the neighbours garden, the leaves are massive.
The nuts on google look similar to pecans, same family.

 

No nuts yet @pete - I bought it as a whip about 18 months ago. Even though it's only a couple of feet tall in a pot, the foliage is enormous. I have a slow project to clear an area at the start of the woodland and plant a mixed orchard (sometimes pretentiously called a food forest!). I have 2 heartnuts for cross pollination, your pawpaw suckers and various seedling pawpaw (from you and USA), old apple varieties, plums and figs (lots). All sitting in large pots for now.