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I don't think you understand what everyone else is talking about so I'll tell you instead of piling on.
They're talking about socket sizes for nuts/bolts. In the US we have fractional inch socket sizes (1/4", 1/2", etc) whereas metric sockets are sized by full millimeters.
So while you are correct in saying you can convert all inch values to millimeter values, you can't always use a metric wrench on an imperial bolt, or vice versa. For example, a 6mm wrench will be slightly too small for a 1/4" bolt, and a 7mm will be slightly too large.
3/4" and 19mm just happen to be close enough to exactly the same that you can use both wrenches on either size bolt.