The 3TB and 4PT calipers are to all intents and purposes the same and both mount on 100mm centres (I've just been out and measured!)
You will need to use the 4PT disc because it's bigger but it uses M8 fasteners, the 3TB and maybe earlier uses M6. You will need to either drill and tap the hub to M8 or use some kind of collar to take up the extra diameter if you use the M6.
I've got all the various bits in the garage waiting to do a similar swap myself so if you want any extra info just ask.
Regards - Alastair.
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