yes it is. Use thinset over tape
You do not need mesh, you can use thin-set mortar between the cracks.
Thinner and wider in most cases. You can use same if needs be. Correct term is 'Scrim Tape' and is cheap and can be bought for under ?10 a roll. BUILDCENTER, JEWSONS, TravisPerkins is a good place for it. Even B&Q do it but if you go in and ask for it they will look at you like you have just asked for moon rock!
The mesh tapes are different. Do not use the tape for drywall for the cement board. They sell the mesh tape for cement board in the same area as cement board. The drywall tape will react to the thinset so you need the mesh tape formulated for cement board and thinset.
It's similar, but wider. Hope this helps.
