[libreoffice-users] Different character spacing on different PCs in writer.

I am sure this must have come up before but can't locate any discussion. 
In writer the same odt file presents different horizontal character 
spacing between different PCs. This means sharing the document for 
editing is not necessarily possible.
In the manual I am editing at present the difference adds 4 pages.
The font used is installed from the same font file. Nothing is inherited 
from the default paragraph style.
I have 2 Linux machines, same OS, same version of LO (24.2.4.2). One has 
wider character spacing than the other, wrapping more lines, moving 
images and adding 4 pages. If I apply a character style with -0.1pt 
character spacing it brings the wider spacing back close to the original 
spacing.
I have given the document to a colleague with Win11 for amendments and 
he sees the closer spacing. I have also loaded the document onto my MAC 
with LO 24.2.5.2 which displays the wider spacing.

I would appreciate any help in what may be causing this issue and how to 
control it. I am particularly perplexed with the fact that it can be 
different on 2 near identical PCs.
TIA

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