What is the reason for not wanting Acetochlor post?

Let's say you wanted to run Acetochlor upfront and Outlook or Dual post, can you overlap the annual rate for each active or do you need make sure the sum of each active is only 100% because they are both group 15s?

For example: Could you theoretically run 3 lbs (3.4 Pints/100% annual rate) of Surpass in a pre pass and 1.91 lbs (2 Pints/77% annual rate) of Dual 2 in a post pass?

Here is Dual 2 Magnum label;
Maximum Single Application Rate: 2.6 pt/A (2.48 lb ai/A of S-metolachlor)
a. DO NOT apply more than 2.6 pt/A in a single preemergence application (2.48 lb ai/A of S-metolachlor).
b. DO NOT apply more than 2.0 pt/A in a single postemergence application (1.91 lb ai/A of S-metolachlor).
3) Minimum Application Interval: Not Applicable
4) Maximum Annual Rate: 3.9 pt/A/year (3.71 lb ai/A of S-metolachlor)
a. DO NOT exceed 3.71 lb ai/A/year of S-metolachlor-containing products

Surpass NXT Label;
Maximum Acetochlor Application Rates Per Calendar Year:
Maximum annual acetochlor broadcast application rates for corn
must not exceed 3.0 pounds active ingredient (3.4 pints Surpass NXT)
per acre. Note: One pint per acre Surpass NXT delivers 0.875 pound
active ingredient acetochlor per acr