Zorin does not currently have a newer kernel than Ubuntu 22.04.
It is a "catch as catch can" situation, where Zorin is often released with a higher kernel than offered in the Ubuntu base.
This caused some confusion in the past, where Zorin OS included the higher kernel, leading people to believe that Zorin had a higher Ubuntu base than it did.
But as the ZorinGroup test and seek a stable kernel that works for the majority of users and as Canonical backports higher kernels to the older supported base - they can catch up, which is where we are now with Ubuntu and Zorin OS 17 on the 6.8 kernel as of Aug, '25
In Lite, there is DPI (Dots per inch) scale that can be adjusted in Settings > Appearance > Fonts (Does nbot apply to Raw Images or Video)
In Settings > Appearance > Settings tab, there is a scaling option, but being integer based is not fractional.
You can use xrandr to achieve the same effect as Gnome on Xorg:
(Replace the example 'eDP-1' with your actual screen ID obtained using xrandr command):
xrandr --output eDP-1 --scale 1.25x1.25
Forpli is correct it will increase vRAM usage. If using a dedicated GPU, it can handle, it, though.
On integrated Intel - the system reserves a portion of your system RAM for graphics use.
You mention two different (Or I am misunderstanding) chipsets...
Intel's Celeron N4100 uses UHD Graphics; it does not offer Arc Graphics.
Is this two different machines?