Yes and no.
Obviously since Smash only has 2 attack buttons, the way you do things is different. For Ryu and Ken, all of your normals have a light and a heavy variant depending on if you tap or hold the button. For example, as Ryu, tapping Jab will do Ryu's light punch into what I think is a target combo (Not entirely sure because I got into SF through SFV and I main Ken), and holding it will do his Heavy Kick (Ken's Medium Kick in SFV, might also be Medium for Ryu but I'm pretty sure it's Heavy). This does not apply for aerials, Smashes, and Dash Attack, which only have 1 attack each.
Specials are where it starts getting cool. You can do an input with a button or with the commands from SF, where the input version is stronger. The following moves can be done as input or button specials as either Ryu or Ken:
- Hadoken (Neutral B)
- Shoryuken (Up B)
- Tatsumaki Senpukyaku (Side B)
The longer you hold the button determines how strong the special is, and in Ken's case, only the Heavy Shoryuken has fire effects. Also, on the topic of specials, both characters have Focus Attack as Down B, and both can FADC out of it.
Ryu and Ken also have their own command inputs that you can't do with a button. They are:
Ryu:
- Shakunetsu Hadoken
Ken:
- Nata Otoshi Geri
- Oosoto Mawashi Geri
So in general, the characters play sort of like they do in game, but the way you execute normals is different, and the general feel of the game is obviously different. One of the biggest things I noticed having only recently picked up SF is that Shoryuken is not a viable anti-air, mostly because it's your main kill move and you don't want to stale it at low percent.
Either way, I'm really looking forward to trying Ken in Ultimate, from what I've played he's really fun.