Identical twins?

I’ve been trying to identify my great granddad’s biological father and I think I’ve found two men who could potentially be his biological dad. Willie and Frank are the name of those two men and it seems that their descendants have been matching pretty close but the thing is some of my dads first cousins seems to be matches Willie’s line closer and we’re matching franks line closer. I’ve read some where that when it comes to identical twins one line could show up like they’re descendants of one twin but really be the descendants of the other. I’m not sure if that’s what’s going on here but it kinda seems that way or maybe it’s just the randomness of DNA being passed down ?

Here’s how much DNA is share between me, my dad and granduncle with Willie and franks descendants

Frank Harper descendants / granduncles Match List Alma - 7% DNA 502 cM across 13 segments Betty - 3% DNA 223 cM across 8 segments DM - 2% DNA 154 cM across 7 segments BH - 2% DNA 155 cM across 5 segments CP - 1% DNA 100 cM across 5 segments AP - <1% DNA 58 cM across 4 segments Alk - <1% DNA 47 cM across 2 segments

Willie D Harper descendants Angie - 6% DNA 387 cM across 14 segments Judith - 3% DNA 234 cM across 12 segments Sandra - 2% DNA 195 cM across 10 segments Cal - <1% DNA 49 cM across 4 segments

My dads match list Frank Harper descendants Alma - 2% DNA 171 cM across 8 segments Betty - 2% DNA 113 cM across 7 segments Alk - <1% DNA 50 cM across 3 segments DM - <1% DNA 47 cM across 4 segments CP - <1% DNA 32 cM across 1 segment AP - <1% DNA 19 cM across 2 segments

Willie D Harper descendants Sandra - 2% DNA 130 cM across 6 segments Judith - 2% DNA 128 cM across 6 segments Angie - <1% DNA 48 cM across 4 segments Cal - <1% DNA 27 cM across 2 segments

My match list Frank Harper descendants Alma - 1% DNA 100 cM across 5 segments Betty - <1% DNA 51 cM across 4 segments Alk - <1% DNA 42 cM across 2 segments CP - <1% DNA 24 cM across 1 segments DM - <1% DNA 23 cM across 3 segments AP - <1% DNA 8.2 cM across 1 segments

Willie D Harper descendants Angie - <1% DNA 24 cM across 1 segments Sandra - <1% DNA 15 cM across 2 segments

Now this is how much DNA is share between my dad’s first cousins and the Harper matches.

Donna’s matches / franks descendants Alma - 5% DNA 395cM across 11 segments BH - 4% DNA 246cM across 5 segments Betty - 2% DNA 131cM across 6 segments DM - 2% DNA 106cM across 5 segments CP - <1% DNA 50cM across 4 segments Alk - <1% DNA 31cM across 1 segments

Willie’s descendants Angie - 5% DNA 370cM across 13 segments Judith - 4 % DNA 234cM across 9 segments Sandra - 3% DNA 224cM across 10 segments Cal - 2% DNA 112cM across 6 segments

Ayana matches / franks descendants Alma - 3% DNA 216cM across 7 segments Betty - 2% DNA 131cM across 5 segments CP - 2% DNA 115cM across 5 segments BH - 2% DNA 110cM across 5 segments Alk - <1% DNA 40cM across 2 segments AP - <1% DNA 29cM across 1 segments

Willie’s descendants Angie - 4% DNA 247cM across 10 segments Sandra - 2% DNA 186cM across 6 segments Judith - 2% DNA 111cM across 5 segments Cal - 2% DNA 110cM across 4 segments

Jerome matches / frank descendants Alma - 3% DNA 212cM across 8 segments BH - 1% DNA 94cM across 4 segments Betty - <1% DNA 59cM across 4 segments DM - <1% DNA 23cM across 3 segments CP - <1% DNA 21cM across 1 segments

Willie’s descendants Judith - 4% DNA 251cM across 8 segments Sandra - 3% DNA 218cM across 7 segments Angie - 2% DNA 134cM across 6 segments Cal - <1% DNA 64cM across 4 segments

Dev matches / franks descendants Alma - 2% DNA 157cM across 7 segments Betty - 1% DNA 103cM across 5 segments BH - 1% DNA 91cM across 4 segments DM - <1% DNA 40cM across 3 segments Alk - < 1% DNA 42cM across 2 segments CP - <1% DNA 27cM across 2 segments AP - <1% DNA 21cM across 2 segments m

Willie’s descendants Angie - 2% DNA 216cM across 7 segments Sandra - 2% DNA 160cM across 8 segments Judith - 2% DNA 112cM across 6 segments Cal - 1% DNA 98cM across 5 segments

Destiny matches / franks descendants Alma - 2% DNA 113cM across 5 segments BH - <1% DNA 60cM across 2 segments DM - <1% DNA 45cM across 3 segments Betty - <1% DNA 39cM across 4 segments AP - <1% DNA 31cM across 3 segments

Willie’s descendants Angie - 3% DNA 223cM across 9 segments Judith - 2% DNA 158cM across 5 segments Sandra - 2% DNA 146cM 7 segments Cal - 2% DNA 45cM across 3 segments

I apologize for such a long post but I just wanted opinions on the thoughts I have on it