Issue also is that this one above shows reviews in the about tab but no reviews on Reviews tab. How can that be fixed?
https://plus.google.com/u/0/b/104079571650484629140/+searchbug/about - This is main company brand but no reviews on this one.
How can we merge these two profiles and get our reviews to show up using our as the branded page?
plus.google.com/+searchbug is a plain ordinary brand page. No review/maos feature for Brand pages. This is also the page you link to.
It is not possible to merge these pages, but you can either, transfer the local element from the local page to your brand page. Or you can transfer your youtube channel to your local page. It is not possible to switch custom url's between the pages.
If you want to move your channel(s) to a different Google+ Page, you can find the option in their advanced settings (www.youtube.com/account_advanced).
YT Help Center Article: https://support.google.com/youtube/answer/3056283
to transfer the local element of page see instructions here