Byzantine Trachys identification

Please help identifying 2 trachys.  The one at the top of the picture is 19x21 mm and weighs 1.21 g while the one in the middle is 21x24 mm and weighs 1.23 g.  The bottom photo is a slant view of both cups.  Note relatively small curvature.  

Byzantine Empire: Michael VIII Palaeologos (1261-1282) Æ Trachy, Thessalonica (Sear 2304; LBC 595; PCPC 77; Bendall-Donald T.11; DOC V.174-75; Lianta 595)

Obv: ΓΟΑΔΗΜΗΤΡΙΟC in two columnar groups; Half-length figure of St. Demetrius, beardless and nimbate, wearing tunic, breastplate and sagion; seated upon throne without back; holds sword across knees
Rev: ΜΙ/Ο/ΠAΛ/Є/O to left, ΔЄC/ΠΟ to right; Three-quarter-length figure of emperor wearing stemma, divitision, jeweled loros of simple type and saigon; right hand holds large patriarchal cross; left hand holds anexikakia

Thanks!  Do you think the minor differences are due to different mint or different die maker?  

Any ideas on #2??

Damn…wrong coin. That is what happens when you are working on multiple things at the same time. Let me get the correct coin.

Were you able to do anything more in identifying these Trachys??

In any case, thanks for your efforts.