AGFA APX400 - old vs new, how to tell???

Well, there is my question - I have some Agfa APX 400 35mm film (odd rolls of 20 exp...) that I got at a "going d*****l" sale at one of the local traitors...uhm stores
I noticed that the times for the old emulsion are much, much different than the times for the "new"... and I simply dont know what I have on hand. Can anyone shed some light on this for me? Thanks in advance,

Peter.

New emulsion started at manufacturing batch number marked on box:

35mm em.no.450
120 em.no.260

Thank you! Thats wonderful! I really appreciate it!

I had a peek, and.. I have some of the old stuff - which is great, because I actually liked it better. And now I wont have to shoot blind come development!