Well, what I can say is... the RY's definitely feel close to the Nailbombs in terms of the raw tone.
I've only played it through Amplitube 3 at a lowish volume at the moment, being as it is 11pm !! But I definitely notice a big difference to the Seymour Duncans, also it may be my imagination, but I found it much easier to get the respect volume of each pickup close to one another - more so than the Seymours. I don't know what that could be, but it's something I noticed straight away.
I'll report back more about the tone, but yeah... initially? Very close to the Nailbombs.