Both are used to describe the same thing.

Here's the Spanish and English versions of the same EC regulation No 1482/2006

"Debido a las desfavorables condiciones climáticas de la
cosecha de 2006, la cantidad de cereales panificables
resulta insuficiente para satisfacer la demanda interna
de algunos Estados miembros."
https://eur-lex.europa.eu/legal-content/ES/TXT/PDF/?uri=CELE...

"Due to adverse weather conditions at the time of the
2006 harvest, the quantity of breadmaking cereals is
insufficient to meet the internal demand of some
Member States."
https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELE...
and here https://www.legislation.gov.uk/eur/2006/1482/adopted?view=ex...

Here is 'breadmaking grains' used by Scottish flour producers

"Based on an organic farm in the Scottish Borders, Scotland The Bread conducts research into the nutrient content of a range of breadmaking grains and supports community groups to grow and mill their own grain to bake with."
https://scotlandthebread.org/2017/11/29/scotland-the-breads-...

Here it talks about integrating non breadmaking grains into bread
https://books.google.co.uk/books?id=QsR5CgAAQBAJ&pg=PA43&lpg...

And here
"Fructans are chains of fructose molecules, found in lots of foods, from agave, asparagus, garlic, and onions, to most of the breadmaking grains like wheat, spelt, rye and barley."
https://medicalprices.co.uk/a-complete-guide-to-ibs-how-to-e...