The product is equipped with 8GB of memory soldered to the system board and a DDR4 SO-DIMM slot occupied by 8GB SO-DIMM DDR4-3200, so it has a total of 1 slot for memory expansion, which can be occupied by a 32GB module, giving a total of 40GB of RAM.

Hoi Silvio, yes, the graphics card in the laptop can do that. I have an internal monitor and two external ones connected via USB-C DOCKINGSTATION.

Yes as is supported by the HDMI connection, 3840x2160 pixel 4K UHD works.

This configuration comes without a touchscreen. You can find the entire spec sheet here: https://psref.lenovo.com/Detail/ThinkPad/ThinkPad_E15_Gen_4_Intel?M=21E6004GMZ

Yes

No, the Thunderbolt port is also the charging cable port. When the unit is charging, the HDMI port must be used for screen transfer.

You can easily compare that using the following web-page: https://psref.lenovo.com/ Except different SSD capacity and upgrade-services, there are no real technical differences. For further question, please feel free to contact our consulting-team: https://helpcenter.digitec.ch/hc/de/requests/new