Well, they do both have weapons-for-hands. Only Pelinal's is left and Ebonarm is right.
It goes further:
Both the names Ebonarm and Pelinal contain seven letters.
Ebonarm's only ally is Sheogorath; Pelinal was crazier than a [censored]house rat.
Ebonarm is popular around Iliac b
ay; Pelinal was active in Niben
ay (It rhymes!)
Ebonarm's symbol is a red rose; Pelinal's symbol is a red diamond.
Ebonarm always wore eight pieces of white gold jewelry; Pelinal was martyred in white-gold tower, being torn into eight pieces.
Ebonarm rides a gold stallion called War Master; Pelinal, upon achieving the rank of Magister Bellorum ('War Master') in the Alessian army, was awarded with a small golden statue of a stallion.
Also, M'aiq is actually Alkosh. If you absorb his soul, you learn the hairball thu'um.