If all forces of the first foundings are available in their respective fights this is how I see it going down (I am going to assume this is on a neutral planet due to variable fleet sizes
Dark Angels: Close Dark Angel victory, the main two wings I believe would lead a decapitation strike whilst the rest of the chapter essentaily acts as bait, so I think how it would go Minotaurs engage, battle companies on both sides take severe losses and Ravenwing sits largely in the backfield, then when moloch makes his way to the line the Ravenwing would bolt forward try to gun him down before getting into mellee range, assuming that fails beacons would be dropped and a bunch of rather irked 1st company terminators would show up causing a massive hole in the Minotaur line and slaying Moloch (keep in mind the two wings specialise in decapitation strikes due to the nature of hunting the fallen)
Imperial Fists: Close Minotaurs, I think the defensive tenacity of the IF would reap horrendous casualties against the minotaurs, but that said I personally believe the minotaurs would get this victory.
White Ravens: Total Victory White Ravens, I think the White raven mobility would essentially null and void the Minotaurs style of warfare (compare.....well most eastern mounted horde battles EDIT: or even cavalry v. infantry battles compared to contemperary western armies)
Ultramarines: Total Victory Minotaurs, I am giving this one to the minotaurs not out of some form of UM hate, but rather from what
SM chapters Minotaurs would fight all the time would undoubtedly be codex, and with the UM upholding the codex to the point of insanity this would work for the minotaurs
Salamanders: Victory minotaurs, both have the same quality of tech (roughly), and I could see the minotaurs striking civillian populations to seperate salamanders, at which point divide and conquer wins the day
Raven Guard: Victory Raven Guard, I think hitting the raven guard in a mass effort would be tantamount to try to catch mist, by the end the Minotaurs would be depleted, but due to the average tenacity they would deffinately take more than a few with them
Iron hands: I do not know, honestly I havent read much about them
Blood angels: Khorne....seriously with all the
DC that would be brought to the field it would just turn into a bloody war of attrition, just remember
DC fall under
BA supervision, so this may make up the difference.
Space Wolves: Victory Space Wolves, this is essentially original vs New School, and more importantly they have one weapon in their arsenal that would tip the balance, Bjorn, Bjorn has been around at least 1 LEGION extermination, that knowledge would pay dividends, that and the larger size of the Space Wolves(source for the executioner bit goes to
HH collected visions)
Now remember if you bring in recruits, that means some time has been taken between fights, allowing the first founding to call in help, at which point I think the Minotaurs would be in for a world of hurt (aside from Space Wolves)
Now for the bad

vs bad

section.
Dark Angels: Moloch would fight azrael, and while it wouldnt be a hard fight, I wouldnt consider it easy, afterwards Belial would step up, and get smacked down with about the same amount of effort, effort nonetheless, at this point Sammael would probably swoop in and kill the more weary Moloch......Who said Dark Angels fight fair?

.
Space Wolves: Oddly I think this would break down to Bjorn vs. Moloch. in which it goes to the classic experience vs. Age, however I think moloch might win this single combat
Blood Angels: I think the Executioner would have this (I can't remember his name for the life of me), he essentially makes his living capturing or killing those who are lost completely to rage, and want nothing more than to kill you with every ounce of their being.
Ultramarines: I think Tigurius would step in on this fight and violate Moloch's mind.