Post pics and we can tell you.
TRUE festae have a SMALL white ring near the top of the caudal base. Urophthalmus have the same white ring, but it's larger and pretty much extends from top to bottom of the caudal base.
Urophthalmus are also much more banded while festae often have their bars washed out depending on mood.
Urophthalmus also are more pink.
Festae are also pretty drab when small compared to Urophthalmus, and festae are also more pointy shaped.