An American 10 is more likely to have fake boobs, piercing, tattoos and to dress slutty.
An EE 10 will probably be more natural (no tattoos, no piercing) and will dress more conservatively. Some of them will have fake boobs, but not as much as in the USA.
Both make a great mistress, or a great fuck buddy, but should be avoided for LTR.
Of course there are some exceptions, and EE is changing a lot, but these are the main differences I see.
An EE 10 will probably be more natural (no tattoos, no piercing) and will dress more conservatively. Some of them will have fake boobs, but not as much as in the USA.
Both make a great mistress, or a great fuck buddy, but should be avoided for LTR.
Of course there are some exceptions, and EE is changing a lot, but these are the main differences I see.