they make a huge difference ( the 44 is a cream puff to shoot, even with pretty hot loads, with the comp / nut )... even the edges of the port are angled away from the shooter, so they aren't so loud...
trouble with mass marketing, is while each is very close ( I've never tried to interchange them... one stainless, one blued, & 357 & 44 bore ), he fits each one to the gun, you want to end up with the port perfectly upright, with the barrel / cylinder gap at the right measurement... like fitting a rifle barrel to get the correct headspace...