Maxis match object and Build CC

You can look here for a lot of maxis match content: http://sssvitlans.tumblr.com/Maxis%20match%20content
If you scroll down, there are sections for build and buy mode where you can find furniture and decor items.

These are some creators who specialize in add-ons and resized objects:
https://simsationaldesigns.blogspot.com/search/label/TS4%20Maxis%20Addons
http://modthesims.info/browse.php?gs=4&f=38&showType=1&u=178282
http://modthesims.info/browse.php?gs=4&f=38&showType=1&u=9863720
https://modthesims.info/browse.php?gs=4&f=38&showType=1&u=9705732
http://sims4studio.com/thread/2465/orangemittens-studio
http://theafricansim.tumblr.com/post/151169692369/basegame-add-on-for-movie-hangoutday-of-the-dead pt2 is still listed as a WIP
http://theafricansim.tumblr.com/post/139457861429/romantic-garden-add-on-i-made-some-recolours-of
https://brazenlotussims4.wordpress.com/
http://zx-ta.tumblr.com/post/170513147642/hi-this-time-you-get-a-little-completer-set-for
http://saudade-sims4.tumblr.com/post/112776151124/hipster-loveseat-to-match-my-hipster-sofa-and
http://phyresimblr.tumblr.com/post/148052954989/backyard-stuff-add-on-cringing-every-time-you-are
https://simplistic-sims4.tumblr.com/post/169803410167/parenthood-kitchen-reimagined-part-viimajor

When it comes to thing being slightly different heights, you could always try editing meshes from the games itself. There are loads of guides out there.