Have you ever knitted or crocheted a pair of something small, like sleeves for a baby sweater, tiny socks, or booties, and found that they looked slightly mismatched?
Here is an easy way to solve this problem. Instead of making one at a time, knit both simultaneously on one knitting needle. The key is to "think once, knit once." For example, when you have to increase, you do so on both -- this way your gauge and pattern will be consistent.