It’s a bit of a blackout when I try to recall it, haha. I should figure it out and write it up.
If it’s useful: As far as I can recall it involved simply changing the font family to match, i.e. “Dovesfell”, and then exporting the regular and the italic. The OS font system then figures out that they
belong together.
The scale is slightly different and the linespacing too. Did like a 90% rescale on one and 95% on the other? And then there was something to change in the Metrics window to make the linespacing identical.