Actually it's x2. Because Alexandria and Memphis both have the grain resource so they have massive popualtion growth because they feed each other. And you can't stop it cause they share a land border. So this means that Egypt can pump out full stacks and not drain the cities of man power.
Also if you compare the Seleucid line up to the Egyptian you'll see that they have a distinct advantage.
Seleucid silver sheild legions are level 5 barrack units. The Egyptian equivalent desert axemen are level 3. Seleucid scythed chariots are level 2 but they are very prone to running amok. IIRC egyptian heavy chariots are level 2 as well but they don't run amok and they are the size of a normal cavalry unit. Armoured elephants might beat heavy chariots but they are so expensive that if you lose them it really hurts. Silver shield pikes and pharaohs guards are very similar stat wise, but pharaohs guards are only 160 men to 240 pikes. Cataphracts may come a level earlier to nile cavalry but they are vulnerable to chariots.
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