This is from the instruction I posted for seat heater installation: From the back of the seat, use a long screwdriver and one hand to compress and push the guides up and out.
The guides are split at the bottom and need to be pushed together and then pushed up. You might be able to get a long...
It's not too hard to install new covers. Lots of good information on the forum.
https://forum.ih8mud.com/threads/installation-of-replacement-leather.217863/
I think the difference was the finish. Land Cruiser bumpers originally came painted and the LX450 had to be painted.
I checked all the parts that attach to the bumper - grills, end caps, brackets, fasteners - and they are all the same for both.