here are some possibilities;
I am assuming the two did not know each other and may have been from different parts of the country
DEBORAH ANN QUIMBY Age Progression
Case Type: Endangered Missing
DOB: Oct 9, 1963 Sex: Female
Missing Date: May 3, 1977 Race: White
Age Now: 45 Height: 5'1" (155 cm)
Missing City: TOWNSEND Weight: 120 lbs (54 kg)
Missing State : MA Hair Color: Brown
Missing Country: United States Eye Color: Brown
Case Number: NCMC727916
Circumstances: Deborah's photo is shown age-progressed to 40 years. She was last seen riding her bicycle to her grandmother's home near Townsend, Massachusetts on May 3, 1977
http://www.missingkids.com/missingkids/servlet/PubCaseSearchServlet?act=viewChildDetail&caseNum=829432&orgPrefix=NCMC&seqNum=1&caseLang=en_US&searchLang=en_US
EDWARD CHESTER NYE Age Progression
Case Type: Endangered Missing
DOB: Jul 12, 1963 Sex: Male
Missing Date: Jun 22, 1978 Race: White
Age Now: 45 Height: 5'3" (160 cm)
Missing City: PROSPECT Weight: 120 lbs (54 kg)
Missing State : OR Hair Color: Brown
Missing Country: United States Eye Color: Blue
Case Number: NCMC756709
Circumstances: Edward's photo is shown age-progressed to 41 years. He disappeared while camping with a church group. He went off by himself to go fishing and has not been heard from since. He was last seen wearing brown jeans, a yellow shirt, and tennis shoes.
http://www.missingkids.com/missingkids/servlet/PubCaseSearchServlet?act=viewChildDetail&caseNum=756709&orgPrefix=NCMC&seqNum=1&caseLang=en_US&searchLang=en_US
Case Type: Endangered Missing
DOB: Oct 5, 1960 Sex: Female
Missing Date: Jun 9, 1978 Race: White
Age Now: 48 Height: 5'5" (165 cm)
Missing City: NAPA Weight: 120 lbs (54 kg)
Missing State : CA Hair Color: Blonde
Missing Country: United States Eye Color: Blue
Case Number: NCMC829432
Circumstances: Connie's photo is shown age-progressed to 48 years. She was last seen at home on June 9, 1978.
http://www.missingkids.com/missingkids/servlet/PubCaseSearchServlet?act=viewChildDetail&caseNum=972250&orgPrefix=NCMC&seqNum=1&caseLang=en_US&searchLang=en_US
These are the only ones on NCMEC website missing before 1978 and slightly close...read and discuss