So I hope this isn't a silly question, but if I were to buy my mom say 1/3 of the yardage she would need of kona black for Christmas this year then buy another 1/3 for say mother's day and the last 1/3 for Christmas next year (she won't finish it that fast), the black would all be the same black right? I've worked with yarn before and you need to watch the dye lot number.