The Seleukids get access to the same Galatian roster that Pontos does I believe. And the Galatian Spearmen are basically the equivalent of the Galatian Swordsmen except that their secondary weapon is a spear instead of a javilin.
I would add that the major strength of Macedon besides the reformed Phalanx is their access to Thracian units including the Peltasts which they can recruit unlike any faction except Getai. Epiros has access to Italic infantry ranging from light to heavy and all decently effective. Ptolemies do get great access to Galatian Swordsmen but I feel this is their only major advantage. I don't think Klereuchoi Phalangitai are the equals of Argryaspides and they have very limited recruitment area as well.
On the flip side their Machimoi are very useful but no more useful than say, Eastern Axemen or Cappadocian Hillmen which the Seleukids have great access to.
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