Are we talking about the same product? This is the one I found:
https://mall.industry.siemens.com/mall/en/ww/Catalog/Product/5WG1117-2AB12
yes
http://jenswilly.dk/2019/11/knx-components-with-lpc11u68-mcu/
"SIEMENS 5WG1117-2AB12 which contains a TP-UART2:" part
CH340 is used because it's cheaper than FT232L.
Most of the Nano clone problems with CH340 are down to the bootloader in the Arduino IDE.
Beware fake copies of the FTDI chip as well. I've seen FT232L over-printed with white text. FTDI never do that, their chips are always embossed.
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