Master role set up

We are trying to set up master roles as well as derived roles off the master ones to give access only to certain company codes.

Currently we are using a range of companies in the master role (i.e. AB01 - AB99) and we are only using 10 companies of the possible 99.

Would there any issues if we set up the company as " * " (asterisk) in the master role rather than AB01 - AB99 ? Does anyone foresee any risks associated to using asterisk instead of a wider range ?

Thanks.