Depends on the hub. Some have interchangeable endcaps, some don't. Check you manufacturer's website and the information is probably there somewhere. If you don't find your answer on the manufacturer's website look for the "contact" link and send them a question by email. Most will answer.
If you take a even amount of each end to keep the rim Centred the disc will be out and if you fit uneven end caps to keep the disc right the wheel /rim would be out.
Easy going up to 110 from 100 as just need to add spacers to the ends of each hub end cap and behind the disc mounts.
Unless a wheel was designed to be adapted for both I doubt it will be doable as making a hub that did both would negate any benefit of the the extra width (not that there is any really) and cut there ability to sell new hubs.
Let us know ow what you find out? What hubs are they? Wouldn't mind knowing for sure myself