Compare info between the equipped item and the other (same type) item in the inventory

Basically what title says.

I will give you an example, but this is a simple thing that you also see in most of RPG games which makes it a bit confusing when trying to explain it because you don't have to overthink it.

Anyways, so:

You have a helmet equipped and you loot another helmet from the ground.
Now, inside your inventory you simply hover over the helmet inside your inventory and the tooltip that comes up can also come for the equipped one. The equipped one can have at the top of the tooltip something like "Equipped" green colored so you can know which of the tooltip is from the equipped one.

A very good example is the same as World of Warcraft has it.

Thanks!