The LHT fork has a bit more rake than the Cannondale fork, so you'll have a slightly wider wheelbase for a smooth ride....The difference in rake will have a completely negligible influence on wheelbase. It will, however, effect the handling and responsiveness of the bike. More rake equates to less trail which will "quicken" the bikes handling, that is the bike will turn a bit more eagerly and be a bit less stable in a straight line.
Small differences in rake, say 2 or 3 mm, won't make a major change in responsiveness so it shouldn't be a problem. I've replaced a fork with 40 mm of rake with one with 43 mm on a road bike and the handling change was minor.