Except as otherwise provided in Section 12152 in determining the amount of aid grants payable under a public assistance program, no consideration shall be given to voluntary contributions or grants from other public sources, private agencies, friends or relatives when such contributions or grants meet the following conditions:

1. The service to be provided is designated by the department and is not covered by an assistance allowance under the particular program, and

2. The contribution or grant would not be available for expenditure by or in behalf of the recipient unless it is used in accordance with the conditions imposed by the donor.