Having been in on MMJ's since the beginning, I don't agree. Generally, the earliest 45rpm titles with Hoffman involvement are all bettered. Those that were redone by MMJ in 33rpm are IMO much more punchy and tonally accurate.
I spoke with Rambach quite a bit in those early days. Bearing in mind that he could often make things up, he never wanted to go the 45 r oute but felt forced to as it was a hot audiofool trend at the time, nd he was establishing a new brand and needed them to be different. Ditto with Hoffman's involvement - at that time, the Huff name brought his sheeple to the table.
Once he dropped Hoffman, the sonic signature was different, and when the brand was established, he wanted to redo the Hoffman era titles on 33. They are all IMO significantly better.
Then with MMJ it just became about money, wanting to make as much as possible before retirement. The SRX was part of this, there being nothing proprietary or new about the formulation, as it brought much higher margins to already created plates.
In terms of the titles redone on the BNC series, it is indeed title specific, but I have happily disposed of the corresponding MMJ in most cases.
They sound different. Not better or worse, not radically so, but a bit different. A slight turn of one or two knobs does that.