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.
For example, seeds started in mid-March should be ready for the garden by May 1, according to Ross Penhallegon, horticulturist with the Oregon State University Extension Service. No matter where you are in Oregon, tomato, pepper and eggplant require six to eight weeks from seeding to transplanting.