They all have the same head design AFAIK, but they shave slightly differently due to different weight/balance
BTW, the 22/66 are set numbers and not razor's ones. Those sets come with 4th generation British Aristocrat razor in.
Here is more details: British Gillettes
From my experience the 22/66 is more aggressive than the 58. In short I think it's the same head design, but with a different blade gap. I'd equate the 22/66 closer to a Rocket HD / Red Tip Superspeed and the 58 to a standard SS.
There were some variations as well: Some have Patent Pending and others Brit. Patent 694093, but I don't think that there are differences between those except production dates. And then there was a full brass 58 and one with an Alu handle. According to a friend the brass and alu ones shave the same. Hopefully he sees this thread and can post some photos showing a nice side by side comparison of the 22/66 and both 58s.