I'll confuse this a bit more - particularly since I've grown them.
Sandra Lee notwithstanding, "Pimientos" aren't just any old "sweet red pepper", & they aren't always pickled. They're a specific variety of somewhat oval heart-shaped sweet pepper that turns red when fully ripe. Much sweeter than red bell peppers, they're closely related to the Hungarian sweet "Paprika" peppers (of which there are hot varieties as well).
There are a number of varieties, all fun to grow & delicious to cook with. Terrific raw, stuffed, pickled, & - in the case of the Paprika types - can be dried & ground to make your own paprika for cooking with. If you're able to grow regular bell peppers &/or common varieties of hot peppers in your garden, you can easily grow these lovelies as well, although they do sometimes take a bit longer to ripen.