There is confusion about her date of birth. This is due to what I term "US date format syndrome". It is my belief that her date of birth is 10 June 1979. In Australia 10/6/79 is not 6 October 1979.
Ref: fashionmodeldirectory.com/models, wikidata.org, bodysize.org
On page 73 of her centerfold pictorial (April 1995) it says "Twenty-seven-year-old Briana, a model with 16 years experience, has lived in Mian, Tokyo, and Paris".
I suggest that it would be highly unusual for Penthouse magazine to add 7 years to her age, especially given that models generally try to portray themselves as younger than their true age.
On page 85 of her Penthouse pictorial it says "A true Pisces, 35-22-35 Deborah loves being surrounded by water."
If she is a Pisces then her birthday would be between 19 February and 19 March.
Boobpedia has caused a great deal of confusion by combining two different people.
All of the scans here are of the Penthouse Pet for November 2000 named Mercedes Lynn. In 2001 the Penthouse website listed her birthday as 29 March.
The pornstar Mercedes Lynn born on 3 May 1971 is an entirely different person and the stats above relate to her.
The other Mercedes Lynn at babepedia is a later pornstar with a birthday of 13 March 1989.