Is popcorn as healthy as other "corn" servings?

Factual Questions
1

When I was a child, popcorn was considered a “snack” food - something you had at the movie theater or in front of the TV rather than at dinnertime. Dinnertime corn was from a can, bag, or the cob. To what extent is popcorn different, from a nutrition or health perspective, to other types of corn or ways of eating corn such as corn-on-the-cob, canned corn, and frozen corn?

What I basically mean is this: Corn (as corn on the cob, canned corn, or frozen corn) is generally considered a “healthy veggie” to serve. Could you substitute a reasonably equivalent amount of popcorn (e.g. 1 popped kernel of popcorn = 1.2 kernels of corn from a can) and expect to get roughly the same nutrients and health benefits and expect to not introduce health risks that the “regular” corn wouldn’t have?

E.g.:

Mom: “Son, you need to eat a vegetable with your dinner to promote good health. Have some corn.” <offers a spoonful of canned corn>
Son: “It’s ok, mom, I already made a bag of popcorn.” <crunch> “It’s equivalent healthwise and is a really-and-truly-o veggie.”

2

If it’s air-popped with no salt, sure.

But it’s usually popped in oil, which adds a lot of fat, and is heavily salted.

3

Popcorn also counts as a whole grain if you are looking for more reasons to eat it.

4

canned, frozen, or on the cob corn is fresh, immature corn with a different nutritional composition than mature dry corn, of which popcorn is a variety.

More accurate to compare it with dry corn products like corn meal, polenta, or masa harina (treated corn flour used to make tortillas & tamales).

5

Decent source of fiber. No reason to fatten it up when you can add butter buds, mrs dash, or healthy parm.