What is the difference between `lookup.unreflect()` and `lookup.findVirtual()`?

There are 2 ways i have tried to obtain the MethodHandle to a given function.

Method 1

Method m = MyClass.class.getMethod("myMethod", String.class, Map.class);
MethodHandle mh = MethodHandles.lookup().unreflect(m);

Method 2

MethodType type = MethodType.methodType(void.class, String.class, Map.class);
MethodHandle mh = MethodHandles.lookup().findVirtual(MyClass.class, "myMethod", type);

What is the difference between both of them?