Margaret de Brienne - Should this profile be combined with https://www.geni.com/people/Margaret-de-Briene/6000000006101397829

There are two GENI profiles for similar women named Margaret de Bryan/Brienne. Both women have the same father, but different mothers, and different husbands.
Are these the same person and the profiles should be combined?
If combined as the same person, who is the correct mother?
If not combined as the same person, which one is connected to the wrong father?

Margaret de Brienne Has Margaret de Brienne born c. 1379 to Guy de Brienne 1311-1390 and Elizabeth Montagu 1325-1359, and she was the wife of John de Erlegh. If her mother Elizabeth died 1359, Margaret couldn't be born 1379.
Margaret de Briene Has Margaret de Briene born c. 1340 to Guy de Brienne 1311-1390 and Joan Carew ?-1348, and she was the wife of Hugh de Courtenay.

There was a Margaret, dau of Guy, who married John de Erlegh.

EARLS FAMILY CHRONICLES
Christopher Earls Brennen
John(VI) married Margaret, daughter of Sir Guy de Brien K.G. (who was standard bearer to King Edward III at Crecy) and they had four sons, John(VII), Robert, Richard and Philip, and three daughters [31][11,v.2,p.199]
[31] Table displayed in the Church of St. Michael, Somerton, Somerset, England.

http://freepages.rootsweb.com/~desmier/genealogy/docs/Earles%20of%2...
Scanned copy of EARLES OF ENGLAND-SOMERSET
Appears to me to be from History and Genealogy of the Earles of Secaucus
With an Account of Other English and American Branches ·  Volume 2 By Isaac Newton Earle ·  1925
SIR  JOHN  de  ERLEIGH   (b.  1334;  d.  1410), married Margaret,  daughter   of  Sir  Guy  de  Brien,  Knight  of  the  Garter,  he   left   issue:  John,   Robert,   Richard,   Philip  and   three   daughters.

There was a Margaret, dau of Guy, who married Hugh de Courtenay.

https://www.british-history.ac.uk/vch/berks/vol4/pp369-379
Hugh Earl of Devon settled the manor for her life in 1361 on Margaret daughter of Sir Guy de Brienne, wife of his grandson Hugh son of Hugh de Courtenay. (fn. 54)

https://en.wikipedia.org/wiki/Guy_Bryan,_1st_Baron_Bryan
Guy Bryan, 1st Baron Bryan, KG (born before 1319 and died 17 August 1390)
Before 10 July 1350, he married Elizabeth Montagu (died 31 May 1359),
Had issue - Margaret Bryan (born about 1351), who married Hugh Courtenay (died 1374) [she married Hugh abt 1361, so the 1351 date is wrong-Dale]

Are they the same woman? If so, who is her mother?