Quick Trijicon ACOG TA33 Question

[MFWIC2]

I have been looking for a ACOG for my 7.62x39.
I seen that Trijicon has a ACOG TA33-13 with a 7.62x39 reticle.

My question is (probably stupid, but here it goes).
What is the difference in the TA33-8 (.223) and the TA33 (7.62x39).
I know they are different caliber's but what makes them different or are they similar?

Thanks for any info into this.

[ccrn_csc]

I believe the BDC is calibrated for each specific caliber.

[Failure2Stop]

I believe the BDC is calibrated for each specific caliber.

Yup.
As well as line of sight over bore, barrel length, and ammo type.

[MFWIC2]

Well then I guess it's the TA33-13 for the AK.:D
Or just keep running the Eotech XPS3-0 and save the money for ammo.