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.
Get your seeds started about 6 weeks before your last frost date of the season. Donât plant them very deep, only about 1/4 inch under the soil. Transplanting. The soil needs to be warm before you can put out the eggplant seedlings, which means you need to wait at least 2 to 3 weeks after your frost date to transplant.