Robert Abernathy, ll - Y conflict?

Does NOT say is a CONFLICT.
Are these both correct? Just difference between number of segments compared?
Robert is my son’s 8th great grandfather.
My sons have mot done dna.

My Abernathy sons have NOT done DNA.

Thank you

"R-P312 (R1b1a2a1a1b)
Birth(Haplo) The TMRCA for tree branch of R-L21 (R1b1a2a1a1b4) is estimated at 4300 ybp by the YFull v6.02 tree, being an average of an estimated range of 4800-3800 ybp.
There is often an incompatibility of nomenclature between ISOGG, FamilyTree DNA and 23andMe.
Back in 2010 ISOGG had
R1b1b2a1a2f L21/M529/S145
Isogg 2012 has it as R1b1a2a1a1b4 L21/M529/S145, L459
All are shown here as L21."

Thank you, Erica Howton