Why a different version of Apple Maps on WiFi only model?

I'm sorry, I don't understand what you mean. Are you saying there is only one version of Apple Maps for iPadOS? Or am I stuck using the non-cellular version of Apple Maps since I don't have a cellular iPad? Because I can say for sure that the version on my friend's iPad Pro w/cellular works very differently than the version on my WiFi-only iPad Pro. We are running the same iPadOS build and are updated with the latest version of all apps. And even though I am using an external GPS receiver, which works great for providing my exact location, the Apple Maps app doesn't show directions the same way. I have confirmed this with another person I know who also has an iPadPro WiFi-only and an external GPS receiver. They appear to be different apps. Or else, even though the GPS data is getting into the iPad, it's not being used while navigating to a destination using Apple Maps? Other apps such as Waze work fine, as does Google Maps. Just like a cellular iPad. If I recall, it is mostly in the way the turn-by-turn directions work. Or rather don't work.

Thanks for the links. I will check them out as well.

OK. I looked at your links. They are different apps. The turn-by-turn directions don't work automatically on a WiFi-only iPad. Even with a GPS signal and an internet connection provided externally. And there are additional Map settings available only on the cellular iPad. If I had known this, I would have gotten the cellular iPad. I figured I would use it tethered, and it would work. Thinking that I would simply need an internet connection. As I said, I found out I also needed a GPS receiver. Yet even with both of those bases covered, it still doesn't work the same. And now it's too late to exchange. I was also surprised that my iPhone doesn't provide GPS data to the iPad when tethered. Seems like a good idea. So if anyone else is debating between a WiFi and a cellular model, understand there are limitations you may not have thought about. I'm pretty sure I would get all the features even if I bought the cellular model, didn't get a service plan for it, and did what I initially intended by using my iPhone for mobile internet access.

Thanks very much for your help.