yes pretty much if you don't use the content islands or Portal page. They are options that can be turned on or off in setup. It will still look very close to what you have now.
Except for adding the left column, my Threads forums look pretty similar to my old Classic forums... so yeah, with enough tinkering, anything's possible...
GangsterBB.NET (Ver. 7.6.1.1) PHP Version 5.6.40 / MySQL 5.7.23-23 (was 5.6.41-84.1) / Apache 2.4.54 2007 Content Rulez Contest - Hon Mention UBB.classic 6.7.2 - RIP