I think someone has misguided you as both TX-L and TX limited are both same variants of prado.
Some people call it TXL and some people call it TX limited in our market.
TXL is the fully loaded version of the 2700cc prado.
TZ-G is the fully loaded version of a prado which came with a 4000cc V6 engine till 2012 while the FL version came with the 2800cc diesel engine from 2012 onwards ( currently new fortuner and revo also have the same 2800cc engine.)