Espressif is a prolific developer of RF modules and systems, including their ESP32 devices like ESP32-C3FH4 or ESP32-C3FN4X. The differences between some of these product variations can be difficult to pin down - what do these different suffix numbers mean?
‘H’, in this case, is a high-temperature callout capable of going up to 105C, while ‘N’ would be a normal temperature grade. The ‘X’ indicates a package with a reduced pin count - 18 pins rather than 22. The ‘H’ can easily drop in for an ‘N’ (though not vice-versa), but the ‘X’ and non-‘X’ parts are not footprint compatible and cannot alternate for each other.