Indemnité de renégociation and Indemnité de remploi... are they the same?

Dear xpats,
I am in the process of renegotiating my mortgage. ING has made me an offer. Included in the offer is an amount towards "Indemnité de renégociation". They say that the Belgian law requires them to charge the fee. This is my second mortgage renegotiation with ING. The first time (November 2014) I was just charged €350 for "Frais de dossier". In their offer this time they have added fee for "Frais de dossier" and "Indemnité de renégociation".
I took this offer to BNP and they told me that Belgium law requires the bank to charge 3 months interest and this is known as " Indemnité de remploi".

Are these two things the same? Or can I challenge ING and ask them to not charge me the fee?

Thank you for any advice