conservipedia and wikipedia both run the same wiki software, mediawiki. Hence, you can copy and paste anything from one to the other really easily.
https://www.mediawiki.org/wiki/MediaWiki
If you really want to make it easy, learn to export/import.
https://en.wikipedia.org/wiki/Special:Export
Import might need to be turned on at conservipedia but if you join and talk to the guy about what you want to add, I don't see why he wouldn't welcome more content.
It's not html, it's wiki markup language known as wikitext.
https://en.wikipedia.org/wiki/Help:Wikitext
You should be familiar with it and it should be identical on both systems for all the basic stuff.
Extensions, usually add new wikitext code which is where they might differ, with wikipedia having more bells and whistles installed.
https://www.mediawiki.org/wiki/Manual:Extensions
The export/import process does put a load on the server so there's a limit on how many pages you can grab at a time. I did a couple of hundred one time and it went fine. I think I had one server timeout but I had access to it and was able to change the timeout time from 60 to 360 seconds.
There are other settings like max post time & size that can increased also. The conservipedia guy might be able to temporarily raise the limits.
Thanks for the suggestion and helpful hints, though I think is simply too monumental a task to move the stuff over (and then, almost nobody will look at it). I’m not fully mastered on such skills, anyhow.