What is the difference with sheeps skin and lambs wool for my dad as he is getting bed sores?

Sheeps skin is like a mat. The fur is still attached to the skin and it makes an excellent comfort layer for under bedding. Great for babies, Massage therapists use them on their massage tables for warmth and comfort. This would be a good item for your Dad.
Lambs wool is used for making sweaters, blankets, mittens.....
I also recommend foam wedges for under your Dad so he will not always lie flat, which is part of what causes bed sores. Good luck.
jayjay