Changing to a different lexer in the same window

I did some research and it implies this does not matter. But I want to be 
sure.

At the moment I have:

int CScintillaHelper::OnScintillaCreate()
{
#pragma warning(suppress: 26429)
m_pCLexer = theApp.m_pCreateLexer("xml");
// If I want to re-create the lexer with html ("hypertext") or json 
("json"),
// will I need to delete this one and create again? 

return 0;
}

I have a situation where I need to toggle between CSS and XML in the same 
window. Do I just re-create? Eg:

int CScintillaHelper::OnScintillaCreate(const CString lexer)
{
    if(lexer == L"xml")
    {
#pragma warning(suppress: 26429)
m_pCLexer = theApp.m_pCreateLexer("xml");
    }
    if(lexer == L"css")
    {
#pragma warning(suppress: 26429)
m_pCLexer = theApp.m_pCreateLexer("css");
    }
return 0;
}

And then repeatedly call OnScintillaCreate as needed?

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