I see a difference but because it applies to my relationship now, kinda.

My husband is fine with swinging. Meaning: I can sleep with another man only if that other man’s wife/gf is going to be sleeping with my husband.
My husband is not comfortable with me being with another man in any other way.

We have a 3/4 open relationship. Meaning: my husband can sleep with anyone he wants. I only have free reign to sleep with other women.

I guess it’s all in your definition of the terms.