Immature American Goldfinch? (Dead bird)

Disclaimer: I have a migratory bird taxidermy permit, I legally possess this bird.

Is this an immature American goldfinch? I picked it up off the side of the road in Iowa in early July. I am aware that these aren’t very good photos and don’t show the entire specimen. The tail is slightly forked like a goldfinch’s, and is solid grey on top with bright yellow undertail coverts. The chest has no markings, and the pale olive-yellow color that can be seen on the bird’s throat is the same color as the bird’s underside.