public static Namespace createNamespace(Program program, Namespace namespace,
			Program otherProgram) throws InvalidInputException, DuplicateNameException {
		if (namespace == null) {
			return otherProgram.getGlobalNamespace();
		}
		Symbol otherNamespaceSymbol = getSymbol(namespace.getSymbol(), otherProgram);
		if (otherNamespaceSymbol != null) {
			return (Namespace) otherNamespaceSymbol.getObject();
		}
		Namespace parentNamespace = namespace.getParentNamespace();
		Namespace otherParentNamespace = createNamespace(program, parentNamespace, otherProgram);
		SourceType source = namespace.getSymbol().getSource();
		if (namespace instanceof Library) {
			return otherProgram.getSymbolTable().createExternalLibrary(namespace.getName(), source);
		}
		else if (namespace instanceof GhidraClass) {
			return otherProgram.getSymbolTable()
					.createClass(otherParentNamespace, namespace.getName(), source);
		}
		return otherProgram.getSymbolTable()
				.createNameSpace(otherParentNamespace, namespace.getName(), source);
	}
Given a namespace, create the corresponding namespace in the 
specified otherProgram. If a corresponding namespace already exists, it is returned.
The return namespace body may be different.
@param program program which contains the specified namespace instance
@param namespace namespace to look for
@param otherProgram other program
@return corresponding namespace for otherProgram or null if no such namespace exists.
@throws InvalidInputException if the namespace's name or path is not valid.
@throws DuplicateNameException if the namespace's name or path cannot be created
due to a conflict with another namespace or symbol.
Ghidra/Features/Base/src/main/java/ghidra/program/util/DiffUtility.java