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.
1 Eggplant fruit may not ripen properly due to cold temperatures, pest damage, or infertile soils. 2  Harvest 16 to 24 weeks after sowing when the skin of the fruit is shiny and unwrinkled.  Cut the fruit close to the stem, but leaving about an inch of it attached.