Actually just like in Slow pitch a ball can state the exact same numbers as above and fly different. For example take an ASA ball and a UTRIP ball both Dudley thunder heats and bounce them and see how they fly. Same core same cover same specs 47/375. Let me know what you find out... When you start comparing different brands you can really see a difference.Unlike Slow pitch, the fastpitch ball specifications are identical between ASA and USSSA.
Compression: 375 lbs.
Different manufacturers use different materials. Your Dudley Thunder heads are polyurethane center, where a Rawlings dream seam is high density cork. So, that might explain the different sounds.
There is also a distinct sound difference between demarini and an Easton, and also on off hits. That being said I am still a firm believer that utrip balls fly farther than ASA balls, maybe just stuck in my head from SP days but from what I have seen in practices/ games mirrors that.
Now take a BP poly core vs a new poly core and check that out. should they all fly the same with same specs... in theory yes in real life never happens.
I guess my biggest gripe here is each team brings the ball the OPPOSING team hits with zero regulation in this case. Especially when you watch a player square up on one and it sounds like a TCB ball.