Cosplay help. Alternate UN vs. Crossplay?

Can anybody tell me the difference between alternate universe *genderswap version* vs crossplay? Is there any or is it still considered "crossplay? Example: Say someone wanted to cosplay as Battle Angel Alita (Gunmm) but as a male version. They didn't plan on having the same hair style or color and maybe have slightly modified clothing and maybe modified or extra weapons. Would/could it be considered an Alt UN, Crossplay, both, or a sad attempt at changing a character/original character? Thoughts anybody?