Not quite. The difference between the two is the selector shafts are different lengths, and the selector yolk is also different. As such the defender top housing will not bolt straight on top of a disco box.
So you have two options.
Change the selector shaft and yolk to defender spec. About £100 for both last time I checked, but isn't really a diy job as it's means stripping the gearbox.
Or buy the adapter yolk from Ashcroft I mentioned earlier. About £90, which just fits in nice and simple.[/QUOTE
Many thanks.