It's been a while, but I vaguely remember that VGA mode 13h 320x200 is seen as 320x400 by the monitor.
Speaking under correction, though.
There's a scroller text in the demo "YARDEMO" by a group named "Renaissance" which
describes how to disable the line doubling in order to use 400 lines.
I've recorded a video years ago, since no material was available.
(I'm not affiliated to them. I'm just an user.)
https://www.youtube.com/watch?v=F3mikF1bUT4
https://hornet.org/demos/1992/yardemo.zip
The interesting thing about EGA's 640x350 mode on VGA is,
that it's actually displayed in a 640x400 frame or view port.
Because of that,- a 200 or 400 line mode is used -, EGA timing runs too fast.
Normally, it's in 60 Hz (like CGA), but on VGA it is in 70 Hz.
Unless an EGA emulation mode is used, *maybe*.
Early ISA SVGA cards shipped with a mode utility that allowed for switching into CGA/HGC, EGA, higher res. text modes and so on.
Some cards did the emulation more detailed than others, also.
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel
//My video channel//