color, one comes in a blister pack and the tuberculin syringe and is available outside the US and Canada. Insulin syringe says home use, tb one doesn't.
Other than that, I don't really see a difference. Also tb needle isn't available at drug stores, insulin one is.
Tb syringe is narrower and the units marked on each is different. On these, 100 units insulin is 1 ml or cc, I don't know tb ones.