The band is pretty much the same in both bras. The 34L bra has bigger cups.
Panache Jasmine Balconnet Bra 6951 in Snake Print – Anna Bella Fine Lingerie
Porcelain Elan Balconette Bra by Panache, Black, Balconette Bra
Panache Harper Underwire Balconnet Bra - Black - Curvy
Alana Bra by Bravissimo, Black
Jasmine Balconnet Underwire Bra
Comparing a 32GG Panache Envy Balconnet Bra (7285) with a 32H Bravissimo Millie Bra (LN566)
Alana Bra by Bravissimo, Black
32J - Bravissimo » Alana Bra (AU01)
Comparing a 34F with 32FF in Panache Andorra Plunge (5676)