I have a projector room built in 2007 with my new house.
Electrician installed a 10 meter in-wall standard HDMI cable for my 1080p projector... (for some reason he does not believe in using conduit, should be sacked really).
I'm upgrading to a 4k projector but thought it likely i would need to upgrade the in wall cable-- and there is little chance of pulling a 10 meter cable with 2 90 degree bends.
Did some research, there are just two types of HDMI , Standard HDMI (the original cable standard), and high speed HDMI (bought out around 2011'ish so after my build).
There is no difference between the cables other than high speed has more bandwidth for 4k .
Just to see if I really needed to upgrade the cable, I did a quick test and hooked up the projector standard hdmi cable to my 4k pc display, and it worked just fine!
Excellent....dodged a 'hack up my movie room' bullet!!