I got curious so I compared the furniture, wallpaper, and flooring listed on moriDB for NL vs that on VillagerDB for NH.
At launch, New Leaf had 1271 furniture items. Welcome Amiibo added an additional 493 furniture items. New Horizons has 1069 furniture items. Some of those items were PWPs in NL, so you can knock that number down slightly, but that's about 202 items more in NL at launch without adjusting for PWPs.
At launch, New Leaf had 119 types of flooring. Welcome Amiibo added 42 more. None of these were rugs. New Horizons has 308 rugs and types of flooring. (I don't see an easy way to filter out rugs vs flooring on VillagerDB unfortunately. NH has 147 more types of flooring than NL did *after* WA came out.
At launch, New Leaf had 125 types of wallpaper. Welcome Amiibo added 26. New Horizons has 247 wallpaper options. NH has 96 more types of wallpaper than NL did *after* WA came out.
So yes. NL did have more furniture items at launch than NH does. Presumably, NH is going to have more event furniture added for some of the upcoming holidays like Halloween, Harvest Festival, and Toy Day, which would account for some of the discrepancies (that's 40-60 items right there if they reintroduce the Creepy, Spooky, Harvest, and Jingle series)--I don't think the Bunny Day items were in NH at launch but were added via patch, but I could be misremembering. But NH has vastly more wallpaper and flooring, so this seems like a trade-off with total items being not that far off.