Hi there,
Yes , See the Gotcha , @msfujino is pointing out. You See I can configure the nRF52840 DK to use different GPIO logic levels using the REGOUT0 register, However, there are some differences because the nRF52840 DK has built-in power regulators and selectable supply sources.
HTH
GL 
PJ 
You could maybe get some custom Xiao from Seeed Fusion Service without the LDO setup ?