TD5 Disco Transfer box into 300tdi 90?

I know plenty of people have swapped around their transfer boxes from discos to 90s, but do the TD5 disco transfer boxes match up with a 300tdi defender 90? I have read somewhere that input gears may need swapping, but if boxes are as removed are they a direct swap? Im not sure if the Hi/Lo, diff lock levers are compatible. Do I need the lever from the donor TD5 disco or will my 90 lever fit in its place? Just trying to double check before I set about starting the job and finding I need more bits part way thro. I have the option of a TD5 disco box that looks like the Hi/Lo lever is blanked off with a plate, and Im not sure if mine will fit it. I know the speedO gear will need swapping (if it will fit).
I believe the TD5 disco boxes are slightly different ratios to 300tdi discos (1.21/1...1.22/1)
Any reliable info greatly appreciated as Im new to these things.
Thanks in advance.

As a reply to my own question, TD5 disco transfer boxes aint a simple swap.
1, the fwd drive flange diameters are different (swappable probably)
2, the change linkage (Hi/Lo or diff lock, im not sure) will need swapping.
3, the TD5 box does not have a cable type speedo fitting, maybe electronic. This maybe a swap again of parts of the box casing, but only if you know so !
Voila!