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Originally, emery paper was made from milled emery rock, bonded or sized to paper often with an animal glue for water resistance. Today, synthetic adhesives are used in place of natural glues and silicon carbide is often substituted for emery.
Herein, what is Emery made of?
Emery, or corundite, is a dark granular rock used to make abrasive powder. It largely consists of corundum (aluminium oxide), mixed with other minerals such as the iron-bearing spinels, hercynite, and magnetite, and also rutile (titania).
Subsequently, question is, is emery paper the same as sandpaper?
Sandpaper is just that- paper with an abrasive such as garnet, aluminum oxide or silicon carbide bonded to it. Emery cloth often contains aluminum oxide or iron oxide abrasives. Used mostly for metalworking, it is good at removing rust, corrosion, paint and polishing metals.
IIRC emery cloth is just a wet dry sandable substance similar to sandpaper I'm pretty sure for most applications interchangable, but supermonkey seems to be right. It would be best to just use a file and the finish up with either finer files or sand paper.