I have a .300 Weatherby that really likes the 168 gr TTSX but I see that Barnes offers a TAC-TX that looks identical. Is there more here than meets the eye?

I went to the Barnes web site and didn't really see a definitive answer. Couldn't tell if they're the same bullet labeled differently for different markets or if maybe the TAC-TX has a lower min velocity threshold like the LRX?

Thanks for any insights anyone may have,

Efw