Given the experience we have had as regards the various ways to express similar thoughts and subjects, which evidently is inherent in the rongorongo texts, we ought to continue and try to fit the periods of Keiti together with other texts. And doing so we cannot expect close similarities.

At first we try with Small Santiago / London. In period no. 21 (which is the natural place to look as periods nos. 18-20 did correspond to the Keiti periods 11-12) there seems to be a continuity of parallel subjects:

Ga5-30 Ga6-1 Ga6-2 Ga6-3 Ga6-4
  Kb2-103 Kb2-104 Kb2-105 Kb2-106
Eb4-13 Eb4-14 Eb4-15 Eb4-16 Eb4-17
 
Eb4-18 Eb4-19 Eb4-20 Eb4-21

The fact that ariki is present in all three texts is not enough to make me propose a similarity, but there is also henua with what looks like an arm ending in a closed fist. That together makes it very probable that period no. 21 corresponds to Keiti's period no. 13.

This type of henua occurs in other texts too, but we cannot go further at this moment than also having a look at Mamari, as we already have observed a close parallel between the year texts of Mamari, Keiti and Small Santiago / London.