the main granular patch is written in csound, which you can get on the mac, so you could adapt that one to work on your mac - this could theoretically give you an identical result.
in max, theres quite a few max patches that do granular - if you use Ableton Live then Granulator is popular.
but, given these will be written by different people, and have different parameters and scaling, windows etc, it’ll unlikely be identical - but like something you can find that you like or even prefer.
if your after smearing, then on a mac you could get a version of mutable instruments clouds… not really similar to Nebulae, but popular.