Short answer, yes.
If the phone has more RAM installed I'd expect it to keep more apps in RAM. These may be apps that you've used recently, or apps that you use frequently. They aren't necessarily running, most are probably just dormant in RAM, but that means that the next time you use them they are already loaded, which gives a faster response and saves energy (RAM uses as much energy when it's empty as when it's storing data, so there's no cost to keeping the apps in RAM, but there is an energy cost if you have to load them from storage every time you use them). This is actually the whole point of putting more RAM in a phone, to allow the phone to use it that way (there is nothing in your phone that needs that much RAM to run, the only purpose of it is to improve multitasking - well, that and as a marketing point, of course

).
There's an old Linux mantra, "empty RAM is wasted RAM", and that's how Android, which is based on the Linux kernel, operates. If anything I'd be more worried that the amount of empty RAM means that Samsung aren't making the best use of it than I would be that the average RAM usage has gone up when you have more available.