Reference

What works with what

Motorola kept one Mod connector for the life of the line, so almost every Mod works with almost every phone. The exceptions are the 5G Mod, which needed a Verizon Z2 or later, and the shells, which are cut per model.

ModMoto ZMoto Z Force DroidMoto Z PlayMoto Z2 ForceMoto Z2 PlayMoto Z3Moto Z3 PlayMoto Z4
JBL SoundBoost 2 Speaker●●●●●●●●
JBL SoundBoost Speaker●●●●●●●●
Moto Smart Speaker with Amazon Alexa●●●●●●●●
Moto Stereo Speaker●●●●●●●●
Hasselblad True Zoom●●●●●●●●
Moto 360 Camera●●●●●●●●
Incipio Vehicle Dock●●●●●●●●
Moto 5G Mod–––●–●–●
Moto Mods Development Kit●●●●●●●●
Moto GamePad●●●●●●●●
Incipio offGRID Power Pack●●●●●●●●
mophie juice pack●●●●●●●●
Moto Power Pack●●●●●●●●
Moto TurboPower Pack●●●●●●●●
TUMI Power Pack●●●●●●●●
Moto Insta-Share Projector●●●●●●●●
Polaroid Insta-Share Printer●●●●●●●●
Moto Folio●●●●●●●●
Moto Style Shell●●●●●●●●
Moto Style Shell with Wireless Charging●●●●●●●●

Shells and the vehicle dock are model-specific: they fit the chassis they were cut for, not every Moto Z.