COVID mRNA vaccines aren't dose-equivalent: "A homologous booster with 30μg [Pfizer] increased neutralizing antibody titers to more than 5 times as high as after dose 2. 50µg of [Moderna] increased neutralizing antibody titers 3.8-fold and 2.1-fold" medrxiv.org/content/10.110…
Here's another source saying that 30µg of Pfizer boosts Ab levels more than 50µg of Moderna. Yet we know that 2 x 100µg Moderna is more effective than 2 x 50µg Pfizer 
The 50µg Moderna 3rd shot appears less effective than a 30µg Pfizer. But that's because they aren't equipotent µg to µg. It's likely the Moderna 3rd shot would have been as effective if you had kept it at 100µg. In Australia, the 3rd Moderna dose will be 100µg, in the US, 50µg
Even if the protein-peptide sequence is the same, small changes in manufacturing process or carrying medium can produce a drastic change in its therapeutic properties eg PRCA from rhEPO due to minute changes in manufacturing methods
The conclusion is that 100µg of Moderna mRNA vaxx is very slightly more effective than 30µg of Pfizer mRNA vaxx. But that 30µg Pfizer is more potent than 50µg Moderna. There is no µg/µg dose equivalence between them
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