No way. Darth has more training. I'm saying younger Obi Wan is better than older Obi Wan since he already knows all his tricks except for merging with the force, so technically since Darth was somewhat stronger than old Obi Wan, Darth would be dominated by younger Obi Wan simply because Obi Wan would see him as no more good like he did in Episode 3, just pure dark side and so he wouldn't hold back and with the fact he's already one of the best Jedi Masters AND he's young and fit, he'd most likely dominate Darth.
And now, back to the original I have this to say. Storm Troopers, doesn't matter how many there are, Translanka is right about their firing skills and to top that, they were beaten in the end... by Ewoks. EWOKS. If that doesn't say something about how good Storm Troopers are, I may give up, although that'd go against my Springtime of Youth so I wouldn't give up.
It'd pretty much all come down to Darth being the only one who could take on Crono and gang and if they could defeat(just 7 of them)something as powerful as the Death Star(Lavos)without a ship, they could beat Vadar and the Troopers(Luminare, Dark Matter, Ice 2, Lightning 2, Flare, Dark Mist, Black Hole, Mega Bomb, Fire 2, Hypno Wave which would turn Troopers against Troopers as well, Shock, Area Bomb, Laser Spin, Dino Tail, Charm to rid them of their weapons, Frog Squash, Water 2, and on top of those, there are the double techs and triple techs). It doesn't matter what the Empire would have. Crono and gang would obliterate them.
Not to mention good guys and bad guys.