Is it still 60grams? So I could have a wholemeal pitta if weighs less than 60grams?

Yes the weight for your hex b choice is 60g of wholemeal, but it's wholemeal bread. Not just anything wholemeal. The only pitta breads on the B choice list are:
1 of the BFree Foods Stone Baked Pitta Breads 4 pack (1 x 55g)
1 of the Weight Watchers Love Fibre Pitta Breads, White & Wholemeal 6 pack (1 x 45g)
1 of the Country Kitchens Bakery Round Pittas, Wholemeal 8 pack (1 x 48g)