Guys, tekken dark resurrection has move demonstrations you can trigger, and audible key tones play telling you what face buttons to press during the demo. For example, low is square, midlow is triangle, midhigh is cross, high is circle. Later games added the arrows and changed the key tones to less distinguishable clicks, making them harder to follow, so I always go back to this one if I want to learn a new character.
Speaking of which, I was able to learn a lot of moves and combos for many characters, then go backwards and forward in the series and still use them effectively, so you should be able to also. From my experience, the only series I found to change up the move and combo input for characters has been mortal kombat. Tekken has been pretty consistent though, so returning characters should play largely the same, unless the story indicates otherwise, such as with jin in tekken 3 and 4. That said, characters like Bruce, yoshimitsu, the Williams sisters, Lilly, wang, Julia, sleeve, Paul, all these played largely the same, with their moves expanding as the series progressed. If tekken DR has move demos, im willing to bet that tekken 8 does also.