Correct MB Trans Fluid W210 ???

[cessna5354]

Time to change the '99 E300TD trans fluid. I have two qts. from the last time, which are marked 134.

I pick up more at the dealer, get home and they are marked 3353.

I called dealer and they say the 3353 superceded the 134, and is correct for my trans. If so, can I mix the two ??

I am weary of quick answers, Is this correct ???

Thanks, trans failure will mean death to this car, finiacially.