Leitz 160vs170mm questions about DIC/ICT

Anyone who can help me with these: please reply.
Probably for Leitz specialists only.

First the introduction:
I have a Leitz Dialux 20 and an Orthoplan. Dialux uses 160mm objectives,
Orthoplan 170mm.
The condensers of the two are not interchangeable.
On the Dialux I have two ICT objectives, 16x and 25x, for differential
interference contrast (DIC, or ICT as Leitz calls it).
In the Dialux condenser I have the two corresponding Wollaston prisms for
these objectives, works fine.
I wanted higher magnifications and recently bought the 40x and 100x ICT
objectives from the same series (160mm) plus the ICT condenser that appears
to fit the Ortholux.
I downloaded the Leitz manual for the adjustment of ICT objectives, and I
can see from the pics in that manual that my recently acquired 160mm
objectives and condenser are used on a (170mm) Orthoplan. A revolving
nosepiece
So 160mm objectives are used on a 170mm microscope.

These are my questions:

Can filters from a Dialux condenser be used in a Orthoplan condenser (are
they the same size)?

How can 160mm objectives be used on a 170mm microscope? Is this because of
the 1,25 factor of the revolving nosepiece?









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