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.
Planting Instructions. Eggplant is typically planted as a transplant. Sow the seeds indoors in a loose potting mixture about 6 to 8 weeks before the last expected date of frost in the Spring. Soil temperatures should be between 70 and 75 F for optimum germination. Most seed germinates in 6 to 12 days.