Those characters in Ghost Warriors don't really follow the rules -- at least not the rules for RM2. Some seem to be MERP character classes, such as the Dwarf with 73 OB at level 1, which can be at least partly accounted for by the fact IIRC that Dwarves in MERP get an unusual amount of cultural/background ranks in 1HConcussion weapons.
In RMU, characters at first level will almost always start out with higher hits, better DBs, and many more spell points (if they are spell users).
They might also start out with lower OBs, since the most number of ranks they can spend in a weapon is 2 (though they may also get culture ranks), and some RM2 classes get a +3/level bonus in weapon skills. However, most RMU classes can get a +2/level professional bonus in weapon skills, if they buy 2 ranks in the weapon, so in terms of professional bonuses, the classes in RM2 are about the same as the classes in RMU. Also, RMU characters have access to something RM2 characters did not: knacks. These can increase two skills by between +5 and +20, depending on power level.
Stats are about the same as well, and in fact RMU characters actually could have higher stat bonuses (+15 is the highest in RMU, which corresponds to a +45 in RM2). So, the advantage here clearly goes to the RMU characters too.
RMU characters generally have considerably higher hits, since they get a racial bonus to hit points. Some of those ghost warriors characters have 20 hits at level 1. Any medium-sized RMU character is going to have more than that, barring a terrible constitution stat.
RMU characters are also capable of having much higher DBs as well. The Dwarf in Ghost Warriors is benefitting from a shield-- probably a wall shield for +30 DB. The most he could get from quickness however is his stat bonus. But a Dwarf in RMU could not only get a higher Qu bonus (+45), he could also get an additional +2 from his professional bonus to the shield skill. So again, the RMU characters have higher potential bonuses here as well.
So yes, OBs might be a little less in RMU, but hits, DBs, and powerpoints are all going to be higher. If you are worried that RMU characters might not keep up, you can also increase the power level to Epic, which would mean that the RMU characters can also increase the benefit of their knacks to +20, for an additional +20 bonus at level 1.
An RMU Fighter could theoretically (with perfect stats) start the game with a 95 OB, 119 hit points, and a 77 DB. That is more than could be achieved theoretically in RM2.