If you are talking the actual models as well...
In the warbiker kit, there are indeed a set of larger arms, a large chest and a few large heads (just like Lord S said).
If you are creating a unit, you will find that 3 of the 5 Nob bodies easily fit on a warbike without modification, so they would be a bit larger than normal warbikers as well.
From a WYSIWYG, if you aren't using actual nob bitz for your nob bikers, I would make them bulkier and with more gubbins/armor/bitz, as Nobs should always stand out from boyz.
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