Micropython NANO RP2040 <=> Pi PICO

I am stuck with some issues regarding micropython on the NANO RP2040.
I am trying to get an SD card working under micropython. I found some example for the PI PICO (as well based on RP2040) and that works well.
At the beginning of the sample there´s an import statement
import sdcard

In case of my PI PCIO board this works without any issue, while using the NANO RP2040 I get an error message stating that
sdcard is not available or existing.
On both devices I have installed the related implementation of micropython 1.19.1
I understand, that the implementations between different platforms can/will vary, but in this case both devices use the same microcontroller...
Any idea?

You could try installing this library:

https://github.com/micropython/micropython/tree/master/drivers/sdcard