Difference 3338 = 12 × 260 + 218 (VII Kan to IV Ik, III Chicchan to XIII Akbal).

1,268,523, XIII Akbal.
1,233,985, III Chicchan.

Difference 34,538 = 132 × 260 + 218 (as above).

1,272,423, XIII Akbal.
1,272,465, III Chicchan.

Difference 42 (which is 260 - 218); 42 = IV Kan to IV Imix.

On the other hand the three pairs specified in the Manuscript are as follows:—

1,538,342, IV Ik.
1,535,004, VII Kan.

Difference 3338 = 12 × 260 + 218 as above, by reason of the encircled number 51,419 which is common to both numbers.

1,538,342, IV Ik.
1,535,004, VII Kan.