I want the Callaway Apex DCB 2021, but I would not mind saving a bit and getting the 2020 model or the 2019 edition. Can anyone tell me what the Apex DCB is similar to in other Callaway iron sets?

https://www.callawaygolf.com/golf-clubs/iron-sets/irons-2021-apex-dcb.html

I don't think there is a comparison. The earlier lines didn't have what they tout as a player improvement or DCB club. The 'plain' Apex 21 has more tungsten for weighting than the 19. I upgraded from 15 year old Pings to the Apex 21. DCB in the 5 iron and Apex 21 in the rest of the set up to approach wedge. I like them a lot. Good upgrade from the PIng. There are plenty of online reviews or videos that will help answer your question.
Edit to add try to hit both. I don't see much additional forgiveness in the DCB. The Apex 21 is a forgiving club.

I hit both at a demo day and enjoyed the "confident" look of the DCB. It just gives me more confidence.

Can you tell the difference from the Apex 19 vs Apex 21?

If you are asking me, I've never hit a 19.

Edit to add the dollar difference isn't all that much. If you save a buck and get the 19, the first bad shot you hit (and you will with either) you will suddenly not like the 19 and wish you had bought the 21.

appears to be the maverik is comparable

thanks for the feedback

Matsui said:

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appears to be the maverik is comparable

thanks for the feedback

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The maverik is cast while the apex is forged