That is true, don't even need to change icons.

Years ago when I lived with my parents I had my mother's desktop setup with a dual boot testing things in KDE 3. Went to get a snack and came back to my mother sitting there playing kmahjongg.

She spent two hours playing kmahjongg and kpatience before she yelled wanting to know where her microsoft picture-it was. Never even noticed she wasn't in Windows.