Pink guava on Feijoa mystery

[BayAreaMicroClimate]

So my grandma planted some feijoa trees on the property 50 years ago and I’ve lived here 25 years and only have taken care of it the past 5 years. Did not produce fruit for a very long time or at least I don’t remember because squirrels do eat them. But to the point is my grandma and dad both swear it use to produce pink guavas. I never believed these were graft compatible but it’s just been a mystery. Could the graft have died off years ago? They are both in Myrtaceae but I’ve heard only similar flower types can be grafted? Is that true?

[Plantinyum]

A pic of the plant will def help narrow the species. Pink guavas and feijoa have quite different leaf types.