The Difference Between Empty and Download-Empty Templates

[kookma]

In the core we have $:/core/save/empty

\define saveTiddlerFilter()
[is[system]] -[prefix[$:/state/popup/]] -[[$:/boot/boot.css]] -[is[system]type[application/javascript]library[yes]] -[[$:/boot/boot.js]] -[[$:/boot/bootprefix.js]] +[sort[title]]
\end
{{$:/core/templates/tiddlywiki5.html}}

In tw5.com we have $:/editions/tw5.com/download-empty

\procedure saveTiddlerFilter()
[[$:/core]] [[$:/isEncrypted]] [[$:/themes/tiddlywiki/snowwhite]] [[$:/themes/tiddlywiki/vanilla]] -[[$:/boot/boot.css]] -[type[application/javascript]library[yes]] -[[$:/boot/boot.js]] -[[$:/boot/bootprefix.js]] +[sort[title]]
\end

\procedure savingEmpty() yes

{{$:/core/templates/tiddlywiki5.html}}

Are these two template really different? Or we have two for backward compatibility?

[kookma]

I realized the first also copy the plugins and all system tiddlers!
The second only copy the core and themes!