The fireworks should be the same show regardless of day. However, weather can be a factor! Winds and low clouds will cause a problem with fireworks, so I'd suggest that you try for the show on Friday because there's no guarantee that Saturday will have good weather (i.e. if Friday is canceled for some reason at least you can try again the next night). I don't know that many shows have been canceled recently, but it is always a possibility.
As for the beaches, I'm not that familiar with OC beaches. However we are in a period of "June Gloom" as they call it, where low clouds may be the order of the day. Disneyland is a few miles inland, so any marine layer should burn off in the afternoon, but the beaches may remain overcast all day. In fact, as I sit here typing this it's nearly 3:30pm and we haven't seen the sun yet today.
It's not particularly cold, or even unpleasant, but I just wanted to warn you in case you were banking on sunny skies, sand and surf

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