The lower octane should be safe and possibly make more power compared to the 110.
One thing against the lower octane pump fuel is that it may have ethanol in it. Ideally you want to run ethanol free, especially for racing because ethanol will trigger a fuel meter when tested.
It’s important to consider that octane is only one amongst of properties of fuels. The main consideration in using racing fuel is consistency across batches which far exceeds that of pump fuel.
On the two racing fuels compared, I guess you could look up the specs and look at volatility, vaporization etc. But it might be easier to just test them.
Really it comes down to the application. If you’re getting practice in, the pump 93 might be fine as long as you have a fresh source. However for racing you might have no choice but to run leaded should fuel testing mandate it.
Lead is kind to bearings, smells really nice and does give an extra layer of protection, especially in aircooled engines which see higher localized temps. It’s also a carcinogen of course.
Lastly, make sure you’re comparing like with like in octane ratings. Sticking with RON is a good way to go.