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.
How to Harvest Eggplant. Cut fruits from the plant when they reach full cultivar color and are firm and glossy, about 60-90 days after transplanting ( could be longer or shorter depending on the cultivar you are growing). Make sure to cut the fruits with shears to avoid damaging the plant.