I personally have had only one "Linhof" type board fail to work on my Chamonix 45n1 - a Wista brand board which was oversized very slightly. It still worked if I pushed it firmly into place. When I ordered a bunch of boards on eBay many years ago from one of the Chinese sellers, what I received were Shen-Hao marked boards and very nicely made.

Speaking of Shen-Hao, Linhof recessed boards work fine on my Shen-Hao 6x17, as do all my Linhof-type boards that I have used.

Just some anecdotal data points to add.