I  have this camera and lens set-up with a viltrox adapter and I'm looking to save some cash and get the non pro  version, will the work together? I'm guessing they will but I'm not  quite sure.

Hi, there.
We are sorry for the inconvenience caused.
Please note that BMPCC4K w/ Sigma 18-35mm is not compatible with the RS3, but it can be used with RS3 Pro.
For more details, you can also check this link:
https://www.dji.com/support/compatibility
Thank you for your support.