The 34J's band is a lot longer than the 32K bra. While both bras have cups with similar depths, the 34J has wider cups, which may change the fit entirely.
34F - Bravissimo » Millie Bra (LN566)
Millie Bra by Bravissimo, Ivory
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BRAVISSIMO MILLIE BRA Black LN566 uk28f de es it 60f fr75f
32HH - Bravissimo » Millie Bra (LN566)
Millie Bra by Bravissimo, Ivory
Freya t shirt bra
Millie Bra by Bravissimo, Ivory
fit check] [recommendations] 32G Bravissimo Claudia and Millie : r/ABraThatFits
30F - Bravissimo » Millie Bra (LN566)
BRAVISSIMO MILLIE BRA Black LN566 uk28f de es it 60f fr75f