It's probably not compatible, but if its just a recycler variant I would imagine the adjustments necessary to make it work are not too hard. The biggest issue would be any new models made for it would have to have the textures adjusted.

New models, and somewhere along the line the render system apparently broke all the explosion layering (there are a LOT of layers). I mean if people really want it I can see about getting the ball rolling to update it for use. Still have most of the source assets and the time to do it so wouldn't be too hard.

[EDIT] Loaded up what I had. So outside of literally every model needing to be modified off the new assets / some concepts needing revisiting / assets derived from 1.3 needing replacing, Was noticing which explosions weren't meshing well / failing to render entirely. That and with the newer look of the stock models and explosions, these ones need reworking with new textures regardless.

TL;DR: It can be done, but with the work that will need to go into it it may end up being something new entirely. Also DO NOT simply dump the old version into your addon folder, you will find textures and entire models are missing now.