The Arduino-compatible Pro Micro is similar to the Pro Mini except it uses an ATmega32U4 rather than an ATmega328 microcontroller on board.
5Pcs pro mini atmega32u4 5v/16mhz module board with 2 row pin
PRO MICRO ATMEGA32U4 5V 16MHz Compatible with Arduino Leonardo IOT
Arduino Pro Micro 5V 16Mhz Mini Leonardo Micro Controller
Pro Micro ATMEGA32U4 5V/16MHz Mini MCU Leonardo Manufacturers and
arduino pro mini
Leonardo R3 Plus Development Board ATmega32U4 Module Compatible
Arduino Leonardo Pro Micro ATmega32U4 5V 16MHz
Arduino Leonardo Pro Micro ATMega32U4
Pro Micro ATmega32U4 5V/16MHz Arduino Compatible – STEM Labs Store
OSOYOO Pro Micro Board ATmega32U4 Leonardo 5V/16MHz Module Board Type