You can replace D4 with D6, but not like this. Just reroll all D6 that are 5 or 6. Your options give the advantage to D6 in the 1 and 4 option and to the D4 in the 2 and 3 option. No equal outcomes even if you factor in the average.
The fact that you’ve made it impossible to roll an 8 by replacing 2d4 with 1d6+1 might impact the game just a bit. Also with 2d4 a 5 is 4x as likely (1+4, 2+3, 3+2, 4+1) as a 2 (1+1) or 8 (4+4); with 1d6+1 all outcomes from 2 to 7 are equally likely, so you’re far more likely to get a critical hit or critical miss (if the game has that sort of thing, and you adjust it for the reduced range).
You can replace D4 with D6, but not like this. Just reroll all D6 that are 5 or 6. Your options give the advantage to D6 in the 1 and 4 option and to the D4 in the 2 and 3 option. No equal outcomes even if you factor in the average.
Throw 1 D4 please. Ok I got 5.
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How is a 10% worse roll in case of 2D4 not changing the balance?
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The fact that you’ve made it impossible to roll an 8 by replacing 2d4 with 1d6+1 might impact the game just a bit. Also with 2d4 a 5 is 4x as likely (1+4, 2+3, 3+2, 4+1) as a 2 (1+1) or 8 (4+4); with 1d6+1 all outcomes from 2 to 7 are equally likely, so you’re far more likely to get a critical hit or critical miss (if the game has that sort of thing, and you adjust it for the reduced range).