. The sections in my Bible are in harmony in Mark and Matthew, in your preferred variants they are not.
To be clear, that is preferred variants and translation.
There are writers who stay with the masculine variant, but give reasons for translating it the same as the neuter. Tim Hegg is one.
Mark7.19b Short Note (2005)
The counter-point to that is that there are some early church writers who like the "declared foods clean" understanding. And the counterpoint to that would be that the early church writers might be zealous scavenger eaters, and liked any variant and translation combo that negates the Hebraic perspective on clean foods.