Can LTE-M allocated PRB be re-used for non Cat-M users (normal LTE users)?

Hi Experts,
When enabled LTE-M, 6 PRB ( BR ) is allocated to the CatM users or can be re-used for non Cat-M users ( normal LTE users)?
For instance we have just activated LTE-M and no users yet.
My feeling is that we can provide BR to LTE but it is up to scheduler decision I guess.
Nokia vendor.