I have a couple of doubts?

The main difference is that RDP is a virtual session while VNC captures the physical display, meaning you see exactly what the remote user sees.

Try following in terminal:
dpkg-reconfigure locales
A menu will open where you can select the language. Probably you need to install the right package:
apt install language-pack-es && update-locale
After that log out and in again.

See:
https://dietpi.com/forum/t/chrome-firefox-window-display-issues-on-reinstall-for-bookworm-rpi-4b-8gb/19163/4?u=jappe

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