On Being Different--What It Means to be a Homosexual, by Merle Miller. (Random House, $4.50) Dancing the Gay Lib Blues, (Simon Schuster, $5.95) If there were ever an argument for not judging people by such over-all catego ries as “homosexual,” it is to be found in the vast differences between these two books and the chasm they reveal between the separate worlds of the two authors. Miller is a talented, and successful writer who had a good deal to lose by “‘coming out of the closet” as he did—in the New York Times, of all places, where part of this introspective originally appeared. The thing is that while Miller is writing about being different, he doesn't SEEM different, except perhaps more articulate, than some of our more intelligent friends. Not so Arthur Bell, and even less so some of his friends, such as the transvestite “queens.” Theirs is strictly the under 30 generation of radicals and their radicalism is by no means limited to their proclivi ties. Perhaps if Mr. Bell were the writer Mr. Miller is, it would be easier to empathize with his marijuana-smoking activist ‘gays.’ But an over-30 reader has the feeling that if Mr. Bell uses the term *‘zap’* once more, the reader would like to give him back a good solid “gap” in the vocabulary. Joan Hanauer (UPI) Will You Welcome Now...Da vid Frost, by Willi Frischauer. (Hawthorne, $6.95) Willi Prischauer, who has documented the lives of Aris tote Onassis and the Aga Khans, has turned his sights on entertainer David Frost. This book brings little new Frost information to light as it traces his life from childhood in a small English town where his father was a clergyman to his present status as television talk show moderator. The author fails to give the reader much of a look at David an interesting look at Frost's Frost the man, but he presents business dealings and his daily routine. The chapter tracing Frost's daily movements is the most interesting portion of a generally dull book. Patricia E. Davis (UPI)