Hello Davidlie,
The small one in the TL-WPA4220KIT is also a TP-LINK TL-PA4010. If you buy both kits, one of the three TP-LINK TL-PA4010 is the adapter that is connected to the router (or switch). You can connect one end device (laptop, game console, TV, etc.) to each of the other two TP-LINK TL-PA4010s using an Ethernet cable.
You can connect two devices to the TL-WPA4220 via cable and, if available, also extend the WLAN from your router to another zone.
Take a look at the TL-WPA4220KIT brochure:

https://static.digitecgalaxus.ch/Files...

I would like to hear later whether you have expanded your network in this way and whether you are satisfied ;-)

Greetings TB

Hello Davidlie,
According to the description, the TL-WPA4220KIT consists of a TL-PA4010 and TL-WPA4220. This should therefore be possible.
In addition to the TL-WPA4220KIT, I also have an additional TL-WPA4220 in operation so that I have a strong WLAN in two different zones and do not just amplify a weak signal, but the speed, which is probably already reduced, is no longer increased. Works fine.
It's funny that at Digitec the TL-WPA4220KIT is only around CHF 3 more expensive than a single TL-WPA4220.

Good luck and greetings TB