I checked Wikitree and they’re uncertain also.
https://www.wikitree.com/wiki/Hindley-51 (Comments)
They are the same, but I am still investigating but fairly sure that they should really both be merged with the profile for FitzAviet-1 as being the most correct LNAB. Though there is the possibility these are two separate families both with a man named Lefwin/Leofwin at their head. Either way it needs much more investigation with appropriate sources.
They might be the same person, but there is not enough info (and no sources) to back up your claim. Please updated both profiles with the source of your info, and update the data. Then perhaps we can make a judgement.
Are FitzAviet-1 and Hindley-51 the same person (dates differ but configuration seems to support this.) It seems first Aviet's son the first Leofwin had three kids (Margaret, Swain and Nest) with wife Margaret Unknown and had son Leofwin Jr. with wife Unknown Unknown. The multiple Margarets and multiple Leofwins and competing dates make it hard to tell.
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Lefwin FitzAviet (abt.1110-)
Biography
Lefwin, son of Aviet, had a daughter who married Reginald de Notton. [1]
The wife of Lefwin is Unknown.
Children
Robert FitzLefwin, held a fifth part of half a knight's fee under Henry de Lasey. [2]
Everard FitzLefwin, held half a knight's fee under Henry de Lasey. [3]
Daughter, married Reginald de Notton. [2]
Research Notes
This is not the same family as that of Leofwin, of Lancashire, England. Ælfwine was the name of an ancient King of Deira, and there were several of that name living in England at this time.
(And refers back to https://www.wikitree.com/wiki/Hindley-51)
