Question: Do Richard Matheson and Morgan Llywelyn write different genres of books than eachother?

Context articles: Morgan Llywelyn
Bard: The Odyssey of the Irish
Grania: She-King of the Irish Seas
Finn Mac Cool (novel)
Lion of Ireland
Earthbound (novel)
Pride of Lions (novel)
Red Branch (novel)
Music composition and composers in Pristina
Richard Matheson

Morgan Llywelyn (born December 3, 1937) is an American-Irish historical fantasy, historical fiction, and historical non-fiction writer.
 Her fiction has received several awards and has sold more than 40 million copies, and she herself is recipient of the 1999 "Exceptional Celtic Woman of the Year" Award from Celtic Women International.
Bard: The Odyssey of the Irish is a 1984 historical fantasy novel by Morgan Llywelyn.
 It depicts a hypothetical migration of Galicians to Ireland, led by Amergin the bard and the Sons of the Mil.
 It is loosely based on the Early Irish "Lebor Gabála Érenn" or "The Book of Invasions" found in several medieval manuscripts.
Grania: She-King of the Irish Seas is a historical fiction about Gráinne O'Malley, the so-called "Sea Queen of Connemara", by American-born Irish author Morgan Llywelyn.
"Finn Mac Cool" is by the Irish-American author Morgan Llywelyn and was published in 1994.
 It is a novel based on the Fenian Cycle about the Irish hero Finn Mac Cool and the fianna.
 Terri Windling described it as "a skilfully crafted Irish novel . . . in the shadowy realm between history and mythology".
Lion of Ireland, by the American-Irish author Morgan Llywelyn, is a novel about the life of the Irish hero and High King Brian Boru.
Earthbound is a 1982 novel by Richard Matheson, originally published under the pen name Logan Swanson.
 Matheson removed his name from the original publication by Playboy Press as a result of the publishers' severe editing of the manuscript.
 It was later reprinted under Matheson's name in the United Kingdom in 1989.
 In 2005, the novel was reprinted in its entirety and released in the United States for the first time by Tor Books.
Pride of Lions (ISBN  , 1996), by the American-Irish author Morgan Llywelyn, is a novel about the lives of the children of Irish hero and High King Brian Boru, particularly his son, Donough, after the Battle of Clontarf.
 It is a sequel to "Lion of Ireland" published in 1980.
Red Branch (ISBN  , 1989), by the Irish-American author Morgan Llywelyn, is a novel about the life of the Irish hero Cú Chulainn.
 "Red Branch" novelizes several stories from the Ulster Cycle of Irish mythology, including the well-known Táin Bó Cúailnge (Cattle Raid of Cooley) and Deirdre (of the Sorrows).
Music composition and composers in Pristina refers to music composition and composers who have left their mark in Pristina.
 The importance of Kosovan Folklore on the different genres, their development and their popularity.
 As referring to genres as a categorization would not cover all compositions and composers in a fair way, a highlight of every composers work and different genres is provided because of the different genres a composers work has included throughout the years.
Richard Burton Matheson (February 20, 1926 – June 23, 2013) was an American author and screenwriter, primarily in the fantasy, horror, and science fiction genres.
 He is best known as the author of "I Am Legend", a 1954 science fiction horror vampire novel that has been adapted for the screen four times, as well as the movie "Somewhere In Time" for which Matheson wrote the screenplay, based on his novel "Bid Time Return".
 Matheson also wrote 16 television episodes of "The Twilight Zone" for Rod Serling, including "Nightmare at 20,000 Feet" and "Steel".