External wakeup from deep sleep on XIAO ESP32C3

I have no idea what you mean.
@Dean_Arnold hasn’t specified a device so I can’t cross check pin numbering.
Both XIAO C6 and C6 Dev Kit can use the same pins for this implementation - viz D0, D1, D2 (GPIO 0, 1, 2). Code is interchangeable.

I also don’t understand what is being said or implied here.
ESP32’s support Low Power Wake using RTC_GPIO on EXT1. Doesn’t matter if XIAO or Dev Kit. From the Seeed example…

/*
NOTE:
======
Bit mask of GPIO numbers which will cause wakeup. Only GPIOs
which have RTC functionality can be used in this bit map.
For different SoCs, the related GPIOs are:
- ESP32: 0, 2, 4, 12-15, 25-27, 32-39
- ESP32-S2: 0-21
- ESP32-S3: 0-21
- ESP32-C6: 0-7
- ESP32-H2: 7-14
*/

ESP32-C3 supports many others, viz GPIO0, GPIO1, GPIO2, GPIO3, GPIO4, GPIO5, GPIO6, GPIO7, GPIO8, GPIO9, GPIO10, GPIO11, GPIO12, GPIO13, GPIO14, GPIO15, GPIO16, GPIO17, GPIO18, GPIO19, GPIO20, and GPIO21