अमात्याः सर्व एवैते कार्याः स्युर्न तु मन्त्रिणः ॥ कZ_०१.८.२९च्द् ॥
amātyāḥ sarva evaite kāryāḥ syur na tu mantriṇaḥ
All these may serve as amātyas (executive officials), but not as mantrins (inner councillors).
Amātyas can execute administration broadly; mantrins require a higher threshold of trust and suitability for confidential counsel.