Different results for same code on different OSs

[qedrohenrique]

I have two machines. One with Windows 11, which have Charm4Py installed through pip.
The other one has Ubuntu 22.04, with Charm4Py installed manually from develop branch.

When running almost the same code from the Jacobi example in both machines, i get different results.
The code runned can be found here.

Running it with python -m charmrun.start +p8 512 512 512 64 gives me two results:

Windows with 3602 iterations and an error of 9.997737247047223e-05
Ubuntu with 3901 iterations and an error of 8.453300652988549e-05

I've been wondering if the reason for it resides in the different versions of Charm4Py used, but I'm not sure.
For instance, both of the installations were done withtout --mpi option, but on Windows i use MSMPI and on Ubuntu MPICH.

Any thoughts on this?