I'll help too, but I think the question should be whether there's an easy way to know which LNAB is correct, not which way the merge was set.
It can be an easy call if one of the profiles has documentation about the LNAB or if one LNAB has a typo or the difference is covered by a project's naming guidelines (for example, EuroAristo would say to go with LNAB Corbet when the choices are Corbet & de Corbet; Dutch Roots tends to van Dyke over Van Dyke while New Netherland Settlers is ok with Van Dyke, but neither would support "Dyke" over van Dyke or Van Dyke). If it's between two pre-1500 (even pre-1700) Welsh names, I'd recommend deferring to Cymru or Wales project via a G2G post.
If the MatchBot merge seems like a good idea, I think you should post a comment with that opinion & whether or not you have
* done the research on which LNAB should be used (and say why if you have)
* checked the name guidelines for any applicable projects (and which projects)
* searched for the lowest-numbered profile with that spelling/styling.
For links to projects' naming guidelines, see this page. If I missed any, please add the info (or let me know via a Private Message or a comment posted to that page or mine).