Currently there are some items, that are supported on Linux, but are not supported on Windows. There is a list of items supported by platform:
https://www.zabbix.com/documentation/current/manual/appendix/items/supported_by_platform
But it's possible to easily implement some of those keys also in windows.
For example, in inventory documentation we recommend using these items for populating inventory:

system.hw.chassis[full|type|vendor|model|serial] - default is [full], root permissions needed
system.hw.cpu[all|cpunum,full|maxfreq|vendor|model|curfreq] - default is [all,full]
system.hw.devices[pci|usb] - default is [pci]
system.hw.macaddr[interface,short|full] - default is [all,full], interface is regexp
system.sw.arch
system.sw.os[name|short|full] - default is [name]
system.sw.packages[package,manager,short|full] - default is [all,all,full], package is regexp

But only one of them is supported by Windows platform.
It's possible to get the same information using WMI:
https://docs.microsoft.com/en-us/windows/win32/cimwin32prov/win32-systemenclosure

It would be simpler and more convenient for Zabbix users if as many as possible built in keys would work the same way on all platforms.