I bought a used Neo Carbon that had the fan type charger. I also have a new Neo Prox that has the lighter charger without the built in fan. The lighter chargers are the new style, probably made to be more portable I presume.
They are interchangeable. It's simple hardware change but some Modiary chargers come with 4A charging rate and fan certainly helps in keeping the charger cool.
But Neo Jumper and Neo JET have 2A BMS, so both will work fine.