The main differences between emitter and collector are doping concentration and size. The emitter is heavily doped, while the collector is lightly doped. You could try to swap them, but you'll get a very low \$H_{FE}\$, probably even less than 1.
Image Credit: Photo: Oxmoor House. SEASON: Although available year-round, eggplant is at its peak from July to October. CHOOSING: When selecting, look for eggplants with firm, glossy skin. Size and color vary widely among types, but the eggplant should feel heavy. Avoid those with wrinkled skin, soft spots, or brown patches.
Eggplant is a dark purple or brownish-purple color that resembles the color of the outer skin of European eggplants. Another name for the color eggplant is aubergine. The first recorded use of eggplant as a color name in English was in 1915. The pinkish-purple-grayish color shown in the color box as eggplant was introduced by Crayola in 1998. Different varieties of eggplant may range from indigo to white.