I checked your links and saw this bio for Blaisdell. He should be the same person since he did both sci fi illos and special effects.
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"From All Movie Guide: Paul Blaisdell's career was the stuff that nightmares were made of, especially for baby-boomer filmgoers. Blaisdell's career in movies lasted barely four years, and seldom involved pictures budgeted even in the six-figure range. If he isn't remotely as well known as, say, Dennis Muren or Jim Danforth, then that's because he never had more than a fraction of their budgets to work with. Blaisdell was born in Newport, RI, in 1927, and attended the New England School of Art and Design. Among his first steady work assignments after graduation was as an illustrator for various science fiction pulp magazines. It was during this period that Blaisdell entered the orbit of Forest J. Ackerman, a science fiction writer who would later become famous as the editor of Famous Monsters of Filmland magazine. Ackerman became Blaisdell's agent, and this led to his entry into movies."