I once tried to make filters tests with digital camera and it didn't look close compared with the film results. At least not with my camera.
I still didn't find a time to do it this week and next week I will be busy too. But thanks for the tips.
I post the result here when I have them in case someone in the future look for the same info.
By the way. Does anyone know a good and affordable black and white film that has less than 36 exposures? Because 36 exposure for test are often too many.