It should be possible to rip asset data from the games, in some cases they make things again from scratch.
It's very difficult to get things the same this way, but it's not unheard of and not something SEGA is a stranger too.
Modern developers baulk at the idea as being crazy, but the truth is, this is how most 'ports' were handled back in the early 80s (developers would play a game then attempt to remake the game entirely from scratch).
This is why often, home versions of many games were vastly changed from the original verisons.
For Fantasy Zone Collection on Ps2 SEGA actually re-made all of the first game from scratch - the reason behind them doing so was never covered in the interview by EDGE - but they remade everything so as it was the same as the Arcade original and commented it that it was one of the highest budget Sega Ages 2500 titles...