updating Profiler will add new *optional* features but the content you've used with the original version from back then will stay the same. in other words, you can update without having to choose in between: new features vs. different sounding existing presets. from my limited knowledge, fractal handles this part differently. they update the amp algorithm and that has an influence on the existing presets.
notes: there are a very few exceptions to the rule, mainly for the effects but the core sound (which is the amp and the cab aka the profile) will sound identical. the improvements made to profiling kick in when you make a new profile, existing ones were not altered.